Convert 'enable' to a keyword-only arg to align it with several other…

… methods with a similar signature

wlroots/wlr_types/output.py

@@ -273,7 +273,7 @@ def test(self) -> bool:
         """
         return lib.wlr_output_test(self._ptr)
 
-    def enable_adaptive_sync(self, enable: bool = True) -> None:
+    def enable_adaptive_sync(self, *, enable: bool = True) -> None:
         """
         Enables or disables adaptive sync (ie. variable refresh rate) on this
         output. On some backends, this is just a hint and may be ignored.