fix: remove local macros upon parse error (#3114)

Close all groups after parse, in particular in case of parse error,
completing `Namespace`'s simulation of local definitions.

Fixes #3122

Co-authored-by: ylemkimon <y@ylem.kim>

test/katex-spec.js

@@ -3440,6 +3440,12 @@ describe("A macro expander", function() {
         expect(macros["\\foo"]).toBeFalsy();
     });
 
+    it("\\def doesn't change settings.macros on error", () => {
+        const macros = {};
+        expect`\def\foo{c^}\foo`.not.toParse(new Settings({macros}));
+        expect(macros["\\foo"]).toBeFalsy();
+    });
+
     it("\\def changes settings.macros with globalGroup", () => {
         const macros = {};
         expect`\gdef\foo{1}`.toParse(new Settings({macros, globalGroup: true}));