win-capture: Remove unused strings

After PR #3074, the following strings are no longer used:
 * GameCapture.ForceScaling="Force Scaling"
 * GameCapture.ScaleRes="Scale Resolution"

Commits from PR #3074:
 * 9497589b1603dcacf07e3b81d2f60291eafb3590
 * 63933997586bf88c862159bf5cb20be56b713283

plugins/win-capture/data/locale/en-US.ini

@@ -20,8 +20,6 @@ GameCapture="Game Capture"
 GameCapture.AnyFullscreen="Capture any fullscreen application"
 GameCapture.CaptureWindow="Capture specific window"
 GameCapture.UseHotkey="Capture foreground window with hotkey"
-GameCapture.ForceScaling="Force Scaling"
-GameCapture.ScaleRes="Scale Resolution"
 GameCapture.LimitFramerate="Limit capture framerate"
 GameCapture.CaptureOverlays="Capture third-party overlays (such as steam)"
 GameCapture.AntiCheatHook="Use anti-cheat compatibility hook"