fix: installment split

src/pages/05_quotation/QuotationFormInfo.vue

@@ -132,8 +132,8 @@ watch(
 );
 
 watch(
-  () => paySplitCount.value,
-  (newCount, oldCount) => {
+  () => [paySplitCount.value, summaryPrice.value.finalPrice],
+  ([newCount, _newF], [oldCount, _oldF]) => {
     if (newCount !== null && oldCount !== null) {
       const totalAmount = summaryPrice.value.finalPrice;
 
@@ -342,7 +342,6 @@ watch(
                 :label="$t('quotation.amount')"
                 :model-value="formatNumberDecimal(period.amount, 2)"
                 dense
-                readonly
                 outlined
                 bg-color="input-border"
               >