fix: prevent memory leak in js_setup_aggregate on init_code failure

Ensure JS_FreeContext is called when init_code throws during aggregate setup.
Previously, the context was not freed on exception, leading to a memory leak and
a potential assertion failure in JS_FreeRuntime during shutdown.

Author: andinux

src/sqlitejs.c

@@ -575,7 +575,10 @@ static bool js_setup_aggregate (sqlite3_context *context, globaljs_context *js,
         bool is_error = JS_IsException(result);
         if (is_error) js_error_to_sqlite(context, ctx, result, NULL);
         JS_FreeValue(ctx, result);
-        if (is_error) return false;
+        if (is_error) {
+            JS_FreeContext(ctx);
+            return false;
+        }
     }
 
     JSValue step_func = JS_NULL;