Comment field automatically scrolls out of view on iOS

[jay-hankins]

Bug description
The comment field automatically scrolls out of view on iOS browsers. The automatic scroll/positioning happens on each keypress.

Expected behavior
The comment field should be in view at all times the user is entering their comment.

Steps to reproduce the issue:

1. Open an idea from the ideas feed (on iOS browser. perhaps android as well)
2. Scroll to the bottom of the comments to type a new comment. (must be logged in)
3. On each keypress, notice the issue

Technical details:

• Platform (windows/mac/linux/docker): iOS
• Browser: Safari

Additional context
There's a mixin that handles this. It needs rewritten so that it doesn't autoresize and scroll away.

[jay-hankins]

Additionally, I think there's a chance the scale factor directives for mobile need changed. Not sure, but the page zooms in and out which I believe we don't want.