fix missing space (clang format)

src/idl_gen_cpp.cpp

@@ -39,8 +39,8 @@ class CppGenerator : public BaseGenerator {
  public:
   CppGenerator(const Parser &parser, const std::string &path,
                const std::string &file_name)
-      : BaseGenerator(parser, path, file_name, "", "::"), 
-      cur_name_space_(nullptr){};
+      : BaseGenerator(parser, path, file_name, "", "::"),
+        cur_name_space_(nullptr){};
   // Iterate through all definitions we haven't generate code for (enums,
   // structs,
   // and tables) and output them to a single file.