Fix misused string key in library context menu (#9388)

The "update global" action used key which led to translation issues in Polish.

app/src/main/java/eu/kanade/presentation/library/components/LibraryToolbar.kt

@@ -103,7 +103,7 @@ private fun LibraryRegularToolbar(
 
             OverflowMenu { closeMenu ->
                 DropdownMenuItem(
-                    text = { Text(text = stringResource(R.string.pref_category_library_update)) },
+                    text = { Text(text = stringResource(R.string.action_update_library)) },
                     onClick = {
                         onClickGlobalUpdate()
                         closeMenu()