Fix error from quote in channel autocomplete (#5092)

store/sql_channel_store.go

@@ -1292,7 +1292,7 @@ func (s SqlChannelStore) performSearch(searchQuery string, term string, paramete
 	result := StoreResult{}
 
 	// these chars have special meaning and can be treated as spaces
-	for _, c := range specialSearchChar {
+	for _, c := range specialUserSearchChar {
 		term = strings.Replace(term, c, " ", -1)
 	}