Make the european key behave like escape key

The european key is `less, greater` at the bottom left of the keyboard.

Install/Templates/system/X11/xkb/symbols/pc

@@ -5,7 +5,7 @@ xkb_symbols "pc105" {
     key <ESC>  {	[ Escape		]	};
 
     // The extra key on many European keyboards:
-    key <LSGT> {	[ less, greater, bar, brokenbar ] };
+    key <LSGT> {	[ Escape ] };
 
     // The following keys are common to all layouts.
     key <BKSL> {	[ backslash,	bar	]	};