[ios] fix date/time input is not firing input event

[Fitzmaz]

Brief Description of the PR

<input> component with type="date" or type="time" is not firing input event.

The following use cases are affected:

<input type="date" @input="oninput" />
<input type="date" v-model="value" />

Checklist

• Demo:
• http://dotwe.org/vue/efd4facfe662af7c53c064d17e386c63
• Documentation: