Fix formatting of method signature in Options class

Author: iampopovich

py/selenium/webdriver/webkitgtk/options.py

@@ -55,7 +55,7 @@ def overlay_scrollbars_enabled(self, value) -> None:
         """
         self._overlay_scrollbars_enabled = value
 
-    def to_capabilities(self)-> dict:
+    def to_capabilities(self) -> dict:
         """Create a capabilities dictionary with all set options."""
         caps = self._caps