richedit: Fixed regression caused by destroying the caret.

The regression was caused by destroying the caret when it didn't need to
be shown in the richedit control, but this affected other controls.

dlls/riched20/caret.c

@@ -242,8 +242,6 @@ ME_MoveCaret(ME_TextEditor *editor)
     x = min(x, rect.right-2);
     CreateCaret(editor->hWnd, NULL, 0, height);
     SetCaretPos(x, y);
-  } else {
-    DestroyCaret();
   }
 }