fix Find Back action

(cherry picked from commit fcf43c1)

src/main/studio/ui/SearchPanel.java

@@ -140,7 +140,7 @@ private void doSearch(SearchContext context, SearchAction action) {
             }
         }
 
-        int pos = textArea.getCaretPosition();
+        int pos = context.getSearchForward() ? textArea.getSelectionEnd() : textArea.getSelectionStart();
         textArea.setSelectionStart(pos);
         textArea.setSelectionEnd(pos);
         SearchResult result;