Update screenshots for 1.3 release

[arouinfar]

Tangentially related to #190 and https://github.com/phetsims/acid-base-solutions/issues/192

There have been a few visual changes since the last release including:

• Panel titles are now inside the panels
• Tools RadioButtonGroup is no longer in a panel
• Lots of changes to navbar/joist (8 years worth!)

Individually these changes are relatively minor, but I think it would be nice to spruce things up a bit.

[arouinfar]

Marking as on-hold until #173 is resolved.

[pixelzoom]

173 is resolved and closed, so this issue can be addressed anytime.

[arouinfar]

Screenshots updated in the above commit, closing.