fix(inputNumber): taro h5 style issues #1874 (#1887)

src/packages/__VUE/inputnumber/index.scss

@@ -50,10 +50,14 @@
   }
 
   input,
-  &__text--readonly {
+  &__text--readonly,
+  &__text--input {
     width: $inputnumber-input-width;
     height: 100%;
     text-align: center;
+    display: flex;
+    justify-content: center;
+    align-items: center;
     outline: none;
     border: $inputnumber-input-border;
     font-size: $inputnumber-input-font-size;

src/packages/__VUE/inputnumber/index.taro.vue

@@ -15,6 +15,7 @@
     <input
       v-else
       type="number"
+      class="nut-inputnumber__text--input"
       :min="min"
       :max="max"
       :style="{ width: pxCheck(inputWidth) }"