python/steamutil,steamsync,protontool: Remove space on empty lines

bin/protontool

@@ -83,7 +83,6 @@ class ProtonTool:
                 print("   ", path)
             parser.exit(0)
 
-
     @classmethod
     def parse_args(cls, args, prog=None):
         parser = argparse.ArgumentParser(prog=prog)
@@ -304,6 +303,7 @@ class ProtonTool:
         else:
             print_error("No matching launch configuration in appinfo")
             return 51
+
     def cmd_proton(self):
         # proton and wine subcommands:
         # Run proton respective wine with arguments