Make only Back (not Home) return from Search Results.

It is best to restrict Home to only exit from the application (or
perhaps also for closing the document, though even this is doubtful) and
not use it in any other context, because otherwise pressing Home too
many times may inadvertently exit the application and annoy the user.
It is a bad practice to let user try various keys in different contexts
and hope that one of them may work.

filesearcher.lua

@@ -76,11 +76,7 @@ function FileSearcher:setSearchResult(keywords)
 end
 
 function FileSearcher:init(search_path)
-	if search_path then
-		self:setPath(search_path)
-	else
-		self:setPath("/mnt/us/documents")
-	end
+	self:setPath(search_path or "/mnt/us/documents")
 	self:addAllCommands()
 end
 
@@ -245,7 +241,7 @@ function FileSearcher:addAllCommands()
 			self.pagedirty = true
 		end
 	)
-	self.commands:add({KEY_BACK, KEY_HOME}, nil, "Back",
+	self.commands:add(KEY_BACK, nil, "Back",
 		"back",
 		function(self)
 			return "break"