setScale causes unexpected scroll

[moniika]

Describe the bug

Calling setScale causes an unexpected scroll of the workspace.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://blockly-demo.appspot.com/static/tests/playground.html
2. Pull out at least one block on the workspace
3. Reset zoom with zoom reset button (if not at 1)
4. In the console, execute Blockly.getMainWorkspace().setScale(1) multiple times
5. Observe scroll of workspace.

Expected behavior

Expect workspace to not scroll on repeated setScale calls.

Additional context

The cause of this scroll appears to be the addition of absoluteTop and absoluteLeft to scrollX/scrollY inside of setScale
This math is needed for zoom logic, but not for every function that calls setScroll (zoomToFit and zoomReset_ don't need this translation and have a scrollToCenter call after calling setScale to compensate).

It causes odd behaviour with single-direction scrollbars when zoomReset is called.

[moniika]

Duplicate of #3800