removes unused strings

No longer needed given current implementation

app/brave_generated_resources.grd

@@ -359,12 +359,6 @@ Or change later at <ph name="SETTINGS_EXTENIONS_LINK">$2<ex>brave://settings/ext
       <message name="IDS_IDC_BRAVE_UTILS_SCREENSHOT_FULLPAGE_TO_CLIPBOARD" desc="Title for option to screenshot the full page and copy to clipboard">
         Screenshot Full Page to Clipboard
       </message>
-      <message name="IDS_BRAVE_UTILS_SCREENSHOT_SUCCESSFUL_TITLE" desc="Title of the notification that appears when a screenshot is copied to the clipboard">
-        Screenshot copied to clipboard
-      </message>
-      <message name="IDS_BRAVE_UTILS_SCREENSHOT_SUCCESSFUL_BODY" desc="Message of the notification that appears when a screenshot is copied to the clipboard">
-        You can now paste the screenshot into an image editor or document
-      </message>
 
       <!-- Adblock contenxt menu -->
       <message name="IDS_ADBLOCK_CONTEXT_BLOCK_ELEMENTS" desc="Message for context menu that enables the element picker UI to apply cosmetic filter rules to the page">