(WIP) Fix note editor jumping to bottom

[roundhill]

Fix

Should fix #1580 - Saving the y offset of the note editor and restoring it appears to be the cause of the bug. Opening this PR to test a build from. My theory is that on some devices, when the view needs to be adjusted for the soft keyboard, the OS will scroll the view into view and we were also scrolling the view ourselves which would push it to the bottom.

Test

1. Open a long note
2. Tap in the middle of the note and make some changes
3. The editor scroll position should never change
4. Test making a change on another device to the same note, the editor scroll should stay put
5. Test that search results in a note still scroll into view when you tap the arrows

[wpmobilebot]

📲 You can test the changes from this Pull Request in Simplenote Android by scanning the QR code below to install the corresponding build.

	App Name	Simplenote Android
	Build Type	Debug
	Commit	533baf071302b08120aa5e8a5bd7100c9df0e2d6
	Direct Download	simplenote-android-prototype-build-pr1656-533baf0-018f78fd-fb17-462b-946c-e71fffd3f914.apk