urgent fix for stage_im.js -> buildImData

app/lib/stage_im.js

@@ -630,7 +630,7 @@ class StageIm {
             });
         }
         // 生成数据(需要缓存，并清理缓存)
-        const pre = (this.ctx.stage.im_pre && this.ctx.stage.im_pre !== '') ? this.ctx.stage.im_pre + splitChar : '';
+        const pre = (this.ctx.stage.im_pre && this.ctx.stage.im_pre !== '') ? this.ctx.stage.im_pre + this.splitChar : '';
         for (const [i, im] of this.ImData.entries()) {
             im.im_code = pre + this._getNumberFormat(this.ctx.stage.order, 2) + this.splitChar + this._getNumberFormat(i + 1, 3);
             if (im.gclBills) {