dashicons-hidden not aligned vertically with dashicons-visibility

[markjaquith]

These two icons both share the eye, but they aren't aligned vertically with each other, so if you use it in a toggle (common use case), it will move up and down by what looks like a full pixel.

[liljimmi]

New font files with hidden icon fixed by @empireoflight

[liljimmi]

CSS with hidden Dashicon fixed by @empireoflight

[markjaquith]

In 33373:

Fix vertical alignment of the eye in the "hidden" dashicon to match "visibility".

fixes #33084
props empireoflight, liljimmi

[ocean90]

In 33394:

Dashicons: Fix font ID in SVG file.

see #33084.