Run clang-format against cpp (#4358)

Code/Fuzz/standalone_fuzz_target_runner.cpp

@@ -22,7 +22,7 @@ int main(int argc, char **argv) {
     std::ifstream in(argv[i]);
     in.seekg(0, in.end);
     size_t length = in.tellg();
-    in.seekg (0, in.beg);
+    in.seekg(0, in.beg);
     std::cout << "Reading " << length << " bytes from " << argv[i] << std::endl;
     // Allocate exactly length bytes so that we reliably catch buffer overflows.
     std::vector<char> bytes(length);