perf[uploadExcel]: fix typo

src/views/excel/uploadExcel.vue

@@ -22,13 +22,14 @@ export default {
   },
   methods: {
     beforeUpload(file) {
-      const isLt2M = file.size / 1024 / 1024 < 1
+      const isLt1M = file.size / 1024 / 1024 < 1
 
-      if (isLt2M) {
+      if (isLt1M) {
         return true
       }
+
       this.$message({
-        message: 'Please do not upload files larger than 2m in size.',
+        message: 'Please do not upload files larger than 1m in size.',
         type: 'warning'
       })
       return false