PR: Make context run cell icons match run menu icons

[rhkarls]

Description of Changes

Minor change to the icons of the context menu to make them consistent and match that of the Run menu.

• Wrote at least one-line docstrings (for any new functions)
• Added unit test(s) covering the changes (if testable)

• Included a screenshot or animation (if affecting the UI, see Licecap)

The run menu icons for running cell code looks like this, with different icon for Run cell and Run cell and advance and no icon for Re-run last cell.

The context menu on 5.3.0.dev0 looks like this, with the Run cell icon repeated for Run cell and advance and Re-run last cell.

This PR sets the proper icon for Run cell and advance and removes Re-run last cell on the context menu, so that it is consistent with the Run menu.

Issue(s) Resolved

No issue opened

Affirmation

By submitting this Pull Request or typing my (user)name below,
I affirm the Developer Certificate of Origin
with respect to all commits and content included in this PR,
and understand I am releasing the same under Spyder's MIT (Expat) license.

I certify the above statement is true and correct: @rhkarls

[dalthviz]

Thanks @rhkarls for noticing this and submitting a fix! LGTM 👍

[ccordoba12]

Thanks @rhkarls for your help with this!