refactor(startup): use instance during profile import

src/widget/loginscreen.cpp

@@ -245,10 +245,8 @@ void LoginScreen::retranslateUi()
 
 void LoginScreen::onImportProfile()
 {
-    ProfileImporter* pi = new ProfileImporter(this);
-
-    if (pi->importProfile())
+    ProfileImporter pi(this);
+    if (pi.importProfile()) {
         reset();
-
-    delete pi;
+    }
 }