Refactored the HorizontallyScrollableText struct to handle Unicode strings more uniformly and to not rely on byte boundaries but instead to rely on Unicode char boundaries

src/ui/radarr_ui/root_folders/mod.rs

@@ -42,7 +42,7 @@ impl DrawUi for RootFoldersUi {
           draw_root_folders,
           draw_add_root_folder_prompt_box,
           30,
-          15,
+          13,
         ),
         ActiveRadarrBlock::DeleteRootFolderPrompt => draw_prompt_popup_over(
           f,