ICU-22531 Remove X from XLikelySubtags* #1163

Job	Run time
clang-valgrind-test	12m 52s
clang-valgrind-intltest (utility)	7m 10s
clang-valgrind-intltest (normalize)	7m 50s
clang-valgrind-intltest (collator)	7m 9s
clang-valgrind-intltest (regex)	5m 20s
clang-valgrind-intltest (format)	24m 7s
clang-valgrind-intltest (translit)	9m 9s
clang-valgrind-intltest (rbbi)	9m 7s
clang-valgrind-intltest (rbnf)	9m 7s
clang-valgrind-intltest (rbnfrt)	6m 4s
clang-valgrind-intltest (icuserv)	7m 42s
clang-valgrind-intltest (idna)	5m 50s
clang-valgrind-intltest (convert)	9m 59s
clang-valgrind-intltest (rbnfp)	7m 9s
clang-valgrind-intltest (csdet)	5m 49s
clang-valgrind-intltest (spoof)	6m 6s
clang-valgrind-intltest (bidi)	6m 24s
	2h 26m 54s

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