localedata: ce_RU: update weekdays from CLDR [BZ #21207]

	[BZ #21207]
        * locales/ce_RU (day): Updated (imported) from CLDR.  Uppercase letters
        left unchanged.
        * locales/ce_RU (abday): Minor updates to match (day): Latin uppercase
        "I" replaced with Cyrillic "Ӏ" ("Palochka", Unicode: U04C0).  Trailing
        spaces removed.