Revert "Added Keybord input filter to only register first key press."

This reverts commit 57cd25d5f8.

OpenRA.Platforms.Default/Sdl2Input.cs

@@ -162,11 +162,7 @@ namespace OpenRA.Platforms.Default
 								Platform.CurrentPlatform == PlatformType.Windows)
 								Game.Exit();
 							else
-							{
-								// Only register initial key press
-								if (e.key.repeat == 0)
-									inputHandler.OnKeyInput(keyEvent);
-							}
+								inputHandler.OnKeyInput(keyEvent);
 
 							break;
 						}