fix(VTimePicker): it won't trigger update Value when user only update hour

[advancedor96]

Description

There's an obvious bug in Labs/VTimePicker. When the user first selects the hour and minute, it works fine. However, when the user changes the hour and keeps the minute the same, it does not emit the update:modelValue function. It only emits update:hour.

For example, if you first select "11:50 am" and then try to change it to "12:50 am", you will see that the v-model doesn't change to 12. Because the update:modelValue does not emit.

I remove the emitChange part. Because it is for "update after user change the second". But at that moment, the following lazyInputHour would already changed.