[Glitch] Enable formatjs/prefer-pound-in-plural

Port 2daa5a1549 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/compose/components/search_results.jsx

@@ -127,7 +127,7 @@ class SearchResults extends ImmutablePureComponent {
       <div className='drawer--results'>
         <header className='search-results__header'>
           <Icon id='search' fixedWidth />
-          <FormattedMessage id='search_results.total' defaultMessage='{count, number} {count, plural, one {result} other {results}}' values={{ count }} />
+          <FormattedMessage id='search_results.total' defaultMessage='{count, plural, one {# result} other {# results}}' values={{ count }} />
         </header>
 
         {accounts}