Update template

Remove the checkbox certifying they've searched for existing game issues since it creates a GitHub issue task  andno one is going to pay attention to it anyway.

.github/ISSUE_TEMPLATE/game_compatibility.yml

@@ -1,13 +1,6 @@
 name: Game Compatibility
 description: Report a game's compatibility status on Ryujinx
 body:
-  - type: checkboxes
-    attributes:
-      label: Is there an existing issue for the game?
-      description: Please search to see if an issue/page already exists for the game you're reporting on.
-      options:
-      - label: I have searched the existing game issues
-        required: true
   - type: input
     id: game-name
     attributes:
@@ -77,4 +70,4 @@ body:
       description: Logs files can be found under the "Logs" subfolder in the Ryujinx program folder. 
       placeholder: Drag and drop the log file onto the text area.
     validations:
-      required: false
+      required: false