Fix functionConst TODO (#5261)

Author: chrchr-github

lib/symboldatabase.cpp

@@ -1107,7 +1107,7 @@ void SymbolDatabase::createSymbolDatabaseSetFunctionPointers(bool firstPass)
                 continue;
 
             bool isTemplateArg = false;
-            if (tok->next()->str() != "(") {
+            if (!Token::Match(tok->next(), "(|{")) {
                 const Token *start = tok;
                 while (Token::Match(start->tokAt(-2), "%name% ::"))
                     start = start->tokAt(-2);

test/testclass.cpp

@@ -6061,7 +6061,7 @@ class TestClass : public TestFixture {
                    "    int i{};\n"
                    "    S f() { return S{ &i }; }\n"
                    "};\n");
-        TODO_ASSERT_EQUALS("[test.cpp:7]: (style, inconclusive) Technically the member function 'C::f' can be const.\n", "", errout.str());
+        ASSERT_EQUALS("[test.cpp:7]: (style, inconclusive) Technically the member function 'C::f' can be const.\n", errout.str());
 
         checkConst("struct S {\n"
                    "    explicit S(const int* p) : mp(p) {}\n"