H2O: Fix initial tap detection (#6832)

* Fix initial tap on the H2O

There's no slot 0, so make sure the initialState doesn't get confused by input's init data that otherwise assumes the main slot is 0

frontend/device/kobo/device.lua

@@ -89,8 +89,11 @@ local KoboDaylight = Kobo:new{
 local KoboDahlia = Kobo:new{
     model = "Kobo_dahlia",
     hasFrontlight = yes,
+    -- NOTE: The hardware can technically track 2 different fingers, but we don't seem to be able to figure it out...
     hasMultitouch = no,
     touch_phoenix_protocol = true,
+    -- There's no slot 0, the first finger gets assigned slot 1, and the second slot 2
+    main_finger_slot = 1,
     display_dpi = 265,
     -- the bezel covers the top 11 pixels:
     viewport = Geom:new{x=0, y=11, w=1080, h=1429},
@@ -310,6 +313,16 @@ function Kobo:init()
     }
     self.wakeup_mgr = WakeupMgr:new()
 
+    -- Tweak initial slot, if necessary
+    if self.main_finger_slot then
+        self.input.cur_slot = self.main_finger_slot
+        self.input.ev_slots = {
+            [self.main_finger_slot] = {
+                slot = self.main_finger_slot,
+            }
+        }
+    end
+
     Generic.init(self)
 
     -- When present, event2 is the raw accelerometer data (3-Axis Orientation/Motion Detection)