fix: backslashes in f-string error on file drop dupe widget (#289)

* fix: python complaining about backslashes inside f-string expressions
refactor excessively long f-string into separate variables

* fix: missing f on f-string

* Format with Ruff

tagstudio/src/qt/modals/drop_import.py

@@ -168,8 +168,15 @@ def duplicates_choice(self) -> int:
         if len(self.duplicate_files) > display_limit:
             dupes_to_show = dupes_to_show[0:display_limit]
 
+        dupes_str = "\n    ".join(map(lambda path: str(path), dupes_to_show))
+        dupes_more = (
+            f"\nand {len(self.duplicate_files)-display_limit} more "
+            if len(self.duplicate_files) > display_limit
+            else "\n"
+        )
+
         msgBox.setText(
-            f"The following files:\n    {'\n    '.join(map(lambda path: str(path),self.get_relative_paths(dupes_to_show)))} {(f'\nand {len(self.duplicate_files)-display_limit} more ') if len(self.duplicate_files)>display_limit else '\n'}have filenames that already exist in the library folder."
+            f"The following files:\n    {dupes_str}{dupes_more}have filenames that already exist in the library folder."
         )
         msgBox.addButton("Skip", QMessageBox.ButtonRole.YesRole)
         msgBox.addButton("Override", QMessageBox.ButtonRole.DestructiveRole)