perf(Rate): remove unreachable code (#2332)

example/pages/rate/index.wxml

@@ -21,7 +21,7 @@
     custom-class="van-rate"
     data-key="value3"
     value="{{ value3 }}"
-    size="{{ 250 }}"
+    size="{{ 25 }}"
     color="#ee0a24"
     void-color="#eee"
     void-icon="star"

packages/rate/index.ts

@@ -12,10 +12,7 @@ VantComponent({
     readonly: Boolean,
     disabled: Boolean,
     allowHalf: Boolean,
-    size: {
-      type: null,
-      observer: 'setSizeWithUnit'
-    },
+    size: null,
     icon: {
       type: String,
       value: 'star'
@@ -52,8 +49,7 @@ VantComponent({
 
   data: {
     innerValue: 0,
-    gutterWithUnit: undefined,
-    sizeWithUnit: '20px'
+    gutterWithUnit: undefined
   },
 
   watch: {
@@ -65,12 +61,6 @@ VantComponent({
   },
 
   methods: {
-    setSizeWithUnit(val) {
-      this.setData({
-        sizeWithUnit: addUnit(val)
-      });
-    },
-
     setGutterWithUnit(val) {
       this.setData({
         gutterWithUnit: addUnit(val)

packages/rate/index.wxml

@@ -8,7 +8,7 @@
     class="van-rate__item"
     wx:for="{{ count }}"
     wx:key="index"
-    style="font-size: {{ sizeWithUnit }};padding-right: {{ index !== count - 1 ? gutterWithUnit : '' }}"
+    style="padding-right: {{ index !== count - 1 ? gutterWithUnit : '' }}"
   >
     <van-icon
       name="{{ index + 1 <= innerValue ? icon : voidIcon }}"