[displaymanager] fix issues

src/modules/displaymanager/main.py

@@ -459,8 +459,10 @@ def run():
             if (os.path.exists(greeter_path)):
                 greeter = os.listdir(greeter_path)[0].split('.')[0]
                 greeter_desktop = os.path.join(
-                    greeter_path, greeter, ".desktop"
-                )
+                    greeter_path,
+                    greeter,
+                    ".desktop"
+                    )
                 if (os.path.exists(greeter_desktop)):
                     libcalamares.utils.debug("configure {!s}".format(greeter))
                     "sed -i -e \"s/^.*greeter-session=.*/greeter-session={!s}/\" "
@@ -468,7 +470,6 @@ def run():
                         greeter,
                         lightdm_conf_path
                         )
-                    )
             else:
                 return ("No lightdm greeter installed.")
         else: