refactor: 修改性能测试上传文件数量的限制判断

frontend/src/business/components/performance/test/components/PerformanceBasicConfig.vue

@@ -220,6 +220,7 @@ export default {
       }
       if (newCsvNum + oldCsvNum > this.fileNumLimit - 1) {
         this.handleExceed();
+        return false;
       }
       if (newJmxNum + oldJmxNum !== 1) {
         this.$error(this.$t('load_test.jmx_is_null'));