Bug 983012 - [Sora][Message][Input method]The virtual keyboard is
disable after switching the keyboard as pinyin.
 - Remove the touchmove event listeners from the touched keys when
   switching layouts.
 - Address review comment.
Merge pull request #17374 from RudyLu/keyboard/Bu983012

Bug 983012 - [Sora][Message][Input method]The virtual keyboard is
r=timdream