fuzzer failure --sub1.- interpreting as a short option (#1148)

and getting into odd situations

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

tests/FuzzFailTest.cpp

@@ -341,7 +341,7 @@ TEST_CASE("app_roundtrip_parse_normal_fail") {
     // like HorribleErrors
     CLI::FuzzApp fuzzdata;
     auto app = fuzzdata.generateApp();
-    int index = GENERATE(range(1, 3));
+    int index = GENERATE(range(1, 4));
     std::string optionString, flagString;
     auto parseData = loadFailureFile("parse_fail_check", index);
     std::size_t pstring_start{0};