[clang-query] Fix help text after D91918

After rG5e1801813d93210acae84ff3c68a01512c2df9bc The help command still lists IgnoreImplicitCastsAndParentheses as a valid option.

Reviewed By: aaron.ballman, rsmith

Differential Revision: https://reviews.llvm.org/D97806

Author: njames93

clang-tools-extra/clang-query/Query.cpp

@@ -48,8 +48,6 @@ bool HelpQuery::run(llvm::raw_ostream &OS, QuerySession &QS) const {
         "    AsIs                            "
         "Print and match the AST as clang sees it.  This mode is the "
         "default.\n"
-        "    IgnoreImplicitCastsAndParentheses  "
-        "Omit implicit casts and parens in matching and dumping.\n"
         "    IgnoreUnlessSpelledInSource     "
         "Omit AST nodes unless spelled in the source.\n"
         "  set output <feature>              "