Use version of C++ grammar from 1.37.1

There is an issue in the current version of the grammar that causes duplicate scopes. Until that's fixed, rolling back

extensions/cpp/cgmanifest.json

@@ -6,11 +6,11 @@
 				"git": {
 					"name": "jeff-hykin/cpp-textmate-grammar",
 					"repositoryUrl": "https://github.com/jeff-hykin/cpp-textmate-grammar",
-					"commitHash": "031ef619bef4c5a1ca46e6fa69d7c913e0c32068"
+					"commitHash": "e33a317ccd0babba4b07ffc042ab9796e6412ddc"
 				}
 			},
 			"license": "MIT",
-			"version": "1.13.2",
+			"version": "1.8.15",
 			"description": "The files syntaxes/c.json and syntaxes/c++.json were derived from https://github.com/atom/language-c which was originally converted from the C TextMate bundle https://github.com/textmate/c.tmbundle."
 		},
 		{
@@ -42,4 +42,4 @@
 		}
 	],
 	"version": 1
-}
\ No newline at end of file
+}

extensions/cpp/test/colorize-fixtures/test.cpp

@@ -24,4 +24,4 @@ int main () {
   int t = 2;
   if (t > 0) puts("\n*************************************************");
   return 0;
-}
\ No newline at end of file
+}