Revert "Reland "[clang-format] Update FormatToken::isSimpleTypeSpecifier() (#80241)""

The change caused an asan crash when running the `QualifierFixerTest.IsQualifierType` unittest, see
details: https://github.com/llvm/llvm-project/pull/80241#issuecomment-1938749844

This reverts commit 7f40c5cc.