fix: Fix the continuous occurrence of {}{} filled templates in excel, causing rendering failure after the first one

src/main/java/com/alibaba/excel/write/executor/ExcelWriteFillExecutor.java

@@ -469,7 +469,7 @@ public class ExcelWriteFillExecutor extends AbstractExcelWriteExecutor {
             lastPrepareDataIndex = suffixIndex + 1;
         }
 
-        if (variableCount >= 1) {
+        if (variableCount > 1) {
             analysisCell.setOnlyOneVariable(Boolean.FALSE);
         }