Fix context of Locator input

- In the main window, the locator input (actually the status bar)
  visually feels like being part of the mode widget, so give
  it its context.
- In extra editor windows, the whole editor window should have
  "editor manager" context, so that is also active for the locator
  input.

Task-number: QTCREATORBUG-20626
Task-number: QTCREATORBUG-20071
Change-Id: Ib68d6a8177446572ea59c3cc057eca0706173e11
Reviewed-by: Xing Xiong
Reviewed-by: David Schulz <david.schulz@qt.io>

src/plugins/qmljseditor/qmljseditor.cpp

@@ -1031,7 +1031,7 @@ bool QmlJSEditor::isDesignModePreferred() const
         alwaysPreferDesignMode = true;
 
     // stay in design mode if we are there
-    Id mode = ModeManager::currentMode();
+    Id mode = ModeManager::currentModeId();
     return alwaysPreferDesignMode || mode == Core::Constants::MODE_DESIGN;
 }