[Inline Reply] Stop inflating remote input view for heads up

RemoteInputView is not needed since we only want to show it on expanded. This CL stops inflating and using remote input view on heads up.

Bug: 346976443
Test: Presubmit and manual. Send a heads up notification with Notify. Click Reply and observe notification is expanded and remote input view is activated. Click collapse button and observe keyboard is closed.
Flag: com.android.systemui.expand_heads_up_on_inline_reply
Change-Id: I4c65a713ae7fad63fe4cb33f01d91a723b599cec