Request render after inserting replacement text

The insertReplacementText text comes from an autocorrected word. If we
don't request a render, the cursor will be in the wrong place and the
document doesn't update until the user types another character.

Fixes #1119

src/trix/controllers/level_2_input_controller.js

@@ -443,7 +443,8 @@ export default class Level2InputController extends InputController {
     },
 
     insertReplacementText() {
-      return this.insertString(this.event.dataTransfer.getData("text/plain"), { updatePosition: false })
+      this.insertString(this.event.dataTransfer.getData("text/plain"), { updatePosition: false })
+      this.requestRender()
     },
 
     insertText() {