Place monetary symbol in el_GR and el_CY after the amount

CLDR uses this pattern as well.

	[BZ #22019]
	* localedata/locales/el_GR: Set n_cs_precedes to 0.
	* localedata/locales/el_CY: copy "el_GR" because it is identical.
	* stdlib/tst-strfmon_l.c: adapt test case.