Global: New route for theme reset

Will be useful for themes such as "OpenVK Mobile".

Web/Presenters/UserPresenter.php

@@ -481,6 +481,22 @@ final class UserPresenter extends OpenVKPresenter
         $this->flashFail("succ", tr("information_-1"), tr("two_factor_authentication_disabled_message"));
     }
 
+    function renderResetThemepack(): void
+    {
+        $this->assertNoCSRF();
+
+        $this->setSessionTheme(Themepacks::DEFAULT_THEME_ID);
+
+        if($this->user) {
+            $this->willExecuteWriteAction();
+
+            $this->user->identity->setStyle(Themepacks::DEFAULT_THEME_ID);
+            $this->user->identity->save();
+        }
+
+        $this->redirect("/", static::REDIRECT_TEMPORARY_PRESISTENT);
+    }
+
     function renderCoinsTransfer(): void
     {
         $this->assertUserLoggedIn();

Web/routes.yml

@@ -71,6 +71,8 @@ routes:
       handler: "User->twoFactorAuthSettings"
     - url: "/settings/2fa/disable"
       handler: "User->disableTwoFactorAuth"
+    - url: "/settings/reset_theme"
+      handler: "User->resetThemepack"
     - url: "/coins_transfer"
       handler: "User->coinsTransfer"
     - url: "/increase_social_credits"