USB mouse cursor cannot move unless the left button is down. The patch
refresh the FileBuffer of Editor every time when the 'MainEditorRefresh'
is called to fix this bug.
Cc: Jaben Carsey <jaben.carsey@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Qiu Shumin <shumin.qiu@intel.com>
fb9dd83225