HackStudio: Jump to file location when choosing a Locator suggestion

A couple of tweaks here to make it work better:
- Call `set_cursor_and_focus_line()` to make the Editor scroll to the
  symbol's location.
- Remove focus from the Locator's text box so your cursor jumps to the
  Editor instead of staying in the Locator.

Userland/DevTools/HackStudio/Locator.cpp

@@ -184,6 +184,7 @@ void Locator::open()
 void Locator::close()
 {
     m_popup_window->hide();
+    m_textbox->set_focus(false);
 }
 
 void Locator::update_suggestions()