[chore] Fix a few luacheck errors (#8461)

frontend/apps/reader/modules/readerdictionary.lua

@@ -816,8 +816,8 @@ function ReaderDictionary:startSdcv(word, dict_names, fuzzy_search)
     -- because sdcv cannot handle CJK text properly when fuzzy searching (with
     -- Japanese, it returns hundreds of useless results).
     local shouldnt_fuzzy_search = true
-    for _, word in ipairs(words) do
-        if not util.hasCJKChar(word) then
+    for _, w in ipairs(words) do
+        if not util.hasCJKChar(w) then
             shouldnt_fuzzy_search = false
             break
         end

frontend/ui/elements/common_exit_menu_table.lua

@@ -6,51 +6,51 @@ local _ = require("gettext")
 local exit_settings = {}
 
 exit_settings.exit_menu = {
-	text = _("Exit"),
-	-- submenu entries will be appended by xyz_menu_order_lua
+    text = _("Exit"),
+    -- submenu entries will be appended by xyz_menu_order_lua
 }
 exit_settings.exit = {
-	text = _("Exit"),
-	callback = function()
-		UIManager:broadcastEvent(Event:new("Exit"))
-	end,
+    text = _("Exit"),
+    callback = function()
+        UIManager:broadcastEvent(Event:new("Exit"))
+    end,
 }
 exit_settings.restart_koreader = {
-	text = _("Restart KOReader"),
-	callback = function()
-		UIManager:broadcastEvent(Event:new("Restart"))
-	end,
+    text = _("Restart KOReader"),
+    callback = function()
+        UIManager:broadcastEvent(Event:new("Restart"))
+    end,
 }
 if not Device:canRestart()  then
-	exit_settings.exit_menu = exit_settings.exit
-	exit_settings.exit = nil
-	exit_settings.restart_koreader = nil
+    exit_settings.exit_menu = exit_settings.exit
+    exit_settings.exit = nil
+    exit_settings.restart_koreader = nil
 end
 if Device:canSuspend() then
-	exit_settings.sleep = {
-		text = _("Sleep"),
-		callback = function()
-			UIManager:suspend()
-		end,
-	}
+    exit_settings.sleep = {
+        text = _("Sleep"),
+        callback = function()
+            UIManager:suspend()
+        end,
+    }
 end
 if Device:canReboot() then
-	exit_settings.reboot = {
-		text = _("Reboot the device"),
-		keep_menu_open = true,
-		callback = function()
-			UIManager:broadcastEvent(Event:new("Reboot"))
-		end
-	}
+    exit_settings.reboot = {
+        text = _("Reboot the device"),
+        keep_menu_open = true,
+        callback = function()
+            UIManager:broadcastEvent(Event:new("Reboot"))
+        end
+    }
 end
 if Device:canPowerOff() then
-	exit_settings.poweroff = {
-		text = _("Power off"),
-		keep_menu_open = true,
-		callback = function()
-			UIManager:broadcastEvent(Event:new("PowerOff"))
-		end
-	}
+    exit_settings.poweroff = {
+        text = _("Power off"),
+        keep_menu_open = true,
+        callback = function()
+            UIManager:broadcastEvent(Event:new("PowerOff"))
+        end
+    }
 end
 
 return exit_settings

frontend/ui/elements/common_info_menu_table.lua

@@ -1,6 +1,5 @@
 local BD = require("ui/bidi")
 local Device = require("device")
-local Event = require("ui/event")
 local InfoMessage = require("ui/widget/infomessage")
 local UIManager = require("ui/uimanager")
 local Version = require("version")