Make editor invocation from long screenshots honor preferred editor.

It was doing its own intent creation because it needs to special-case
some of the params for the shared element transition. This change makes
it use ActionIntentCreator and modify the Intent after that as needed.

Test: Manual verification of editor shared transition with flag on.
Bug: 391401141
Flag: com.android.systemui.shared.use_preferred_image_editor
Change-Id: I371395f82cc50e6d0c003ecb1892f09a3fbbea5a