Fix CQS signal modernize-use-emplace in fbcode/folly/cli

Reviewed By: yfeldblum

Differential Revision: D89258173

fbshipit-source-id: 2a7b9f85eadb6ca61b62d90a67d9b44efed629a5

Author: generatedunixname89002005287564

third-party/folly/src/folly/cli/test/ProgramOptionsTest.cpp

@@ -55,10 +55,10 @@ std::string callHelper(
   std::vector<std::string> env;
   switch (style) {
     case ProgramOptionsStyle::GNU:
-      env.push_back("PROGRAM_OPTIONS_TEST_STYLE=GNU");
+      env.emplace_back("PROGRAM_OPTIONS_TEST_STYLE=GNU");
       break;
     case ProgramOptionsStyle::GFLAGS:
-      env.push_back("PROGRAM_OPTIONS_TEST_STYLE=GFLAGS");
+      env.emplace_back("PROGRAM_OPTIONS_TEST_STYLE=GFLAGS");
       break;
   }