kl_GL: Fix spelling of Sunday, should be "sapaat" (bug 20209).

Although CLDR says otherwise, it is confirmed by Oqaasileriffik, the
official Greenlandic language regulator, that this change is correct.

	[BZ #20209]
	* localedata/locales/kl_GL: (abday): Fix spelling of Sun (Sunday),
	should be "sap" rather than "sab".
	(day): Fix spelling of Sunday, should be "sapaat" rather than
	"sabaat".

(cherry picked from commit dae3ed95)