LibJS+Everywhere: Remove all VM::clear_exception() calls

Since VM::exception() no longer exists this is now useless. All of these
calls to clear_exception were just to clear the VM state after some
(potentially) failed evaluation and did not use the exception itself.

Meta/Lagom/Fuzzers/FuzzilliJs.cpp

@@ -214,7 +214,6 @@ int main(int, char**)
             auto completion = interpreter->run(parse_result.value());
             if (completion.is_error()) {
                 result = 1;
-                vm->clear_exception();
             }
         }