Revert pinned items rising to the top of their list

Sorting by the pin column, or the Pinned tab, was enough. order_sql loses its
pinned_first option, pinning no longer reloads the list, and the tests and
changelog line for #35 go. The NULLS FIRST/LAST ordering from the Postgres work
stays.

Closes #36.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

web/src/items.ts

@@ -314,9 +314,7 @@ async function epAction(a: string, e, el, encId?: number){
   const path=`/api/entries/${encodeURIComponent(e.feed_id)}/${encodeURIComponent(e.guid)}`;
   try{
     if(a==='play') play(e, encId!=null ? enc : undefined);
-    // A pinned item sits at the top of its list (the server sorts it there), so the list is
-    // asked for again rather than the row redrawn where it stands.
-    if(a==='flag'){ e.flagged=!e.flagged; await api(path+'/flags',{method:'POST',body:JSON.stringify({flagged:e.flagged})}); redraw(); loadEntries(); }
+    if(a==='flag'){ e.flagged=!e.flagged; await api(path+'/flags',{method:'POST',body:JSON.stringify({flagged:e.flagged})}); redraw(); }
     if(a==='read'){ await setRead(e,!e.read); redraw(); }
     if(a==='get'){
       if(!enc) return;