Revert "limit clear and crop function to playlist/playlist editor"

This was silly idea, I did this so no one could clear the playlist
by accident, but I forgot about the common situation when one can
just clear playlist and add new songs e.g. form browser immediately.

This reverts commit 047dabd41a.

src/ncmpcpp.cpp

@@ -1463,7 +1463,7 @@ int main(int argc, char *argv[])
 				myPlaylist->EnableHighlighting();
 			FreeSongList(result);
 		}
-		else if (Keypressed(input, Key.Crop) && myScreen == myPlaylist)
+		else if (Keypressed(input, Key.Crop))
 		{
 			CHECK_PLAYLIST_FOR_FILTERING;
 			if (myPlaylist->Main()->hasSelected())
@@ -1501,8 +1501,6 @@ int main(int argc, char *argv[])
 		}
 		else if (Keypressed(input, Key.Clear))
 		{
-			if (myScreen != myPlaylist && myScreen != myPlaylistEditor)
-				continue;
 			if (myPlaylist->Main()->isFiltered())
 			{
 				ShowMessage("Deleting filtered items...");