fix download form's form size
Let update form without pop multiple times
Merge remote-tracking branch 'larry/fix/UpdateFormPopMultTimes'

Conflicts:
	NetSparkle/NetSparkleForm.resx
	NetSparkle/NetSparkleForm.zh-TW.resx
Merge remote-tracking branch 'larry/fix/LetDownloadFormFixSize'

Conflicts:
	NetSparkle/NetSparkleDownloadProgress.resx