Format code with black and autopep8 (#490)

Author: 0xMRTT

gradience/presets_manager_window.py

@@ -293,9 +293,7 @@ def on_file_chooser_response(self, widget, response):
                         Adw.Toast(title=_("Preset imported")))
             else:
                 self.toast_overlay.add_toast(
-                    Adw.Toast(
-                        title=_("Unsupported file format, must be .json")
-                    )
+                    Adw.Toast(title=_("Unsupported file format, must be .json"))
                 )
 
         self.reload_pref_group()
@@ -384,9 +382,9 @@ def reload_pref_group(self):
         self.preset_list.set_title(_("User Presets"))
         self.preset_list.set_description(
             _(
-                'See '\
-                '<a href="https://github.com/GradienceTeam/Community">'\
-			    'GradienceTeam/Community</a> on Github for more presets'
+                "See "
+                '<a href="https://github.com/GradienceTeam/Community">'
+                "GradienceTeam/Community</a> on Github for more presets"
             )
         )
 
@@ -411,7 +409,7 @@ def reload_pref_group(self):
             self.preset_empty = Adw.ActionRow()
             self.preset_empty.set_title(
                 _(
-                    "No preset found! Use the import button to import one or "\
+                    "No preset found! Use the import button to import one or "
                     "search one on the Explore tab"
                 )
             )