style: pre-commit.ci fixes

Author: pre-commit-ci[bot]

include/CLI/App.hpp

@@ -799,10 +799,10 @@ class App {
 
     /// Add option for flag with integer result - defaults to allowing multiple passings, but can be forced to one
     /// if `multi_option_policy(CLI::MultiOptionPolicy::Throw)` is used.
-    template <typename T,
+    template <
+        typename T,
         enable_if_t<std::is_constructible<T, std::int64_t>::value && !std::is_const<T>::value && !is_bool<T>::value,
-                    detail::enabler> =
-                  detail::dummy>
+                    detail::enabler> = detail::dummy>
     Option *add_flag(std::string flag_name,
                      T &flag_count,  ///< A variable holding the count
                      std::string flag_description = "") {

tests/AppTest.cpp

@@ -2314,5 +2314,5 @@ TEST_CASE("C20_compile", "simple") {
     auto flag = app.add_flag("--flag", "desc");
 
     app.parse("--flag");
-    CHECK(static_cast<bool>(flag));
+    CHECK_FALSE(flag->empty());
 }