Fix icons path in MANIFEST.in

[ktactac-ornl]

Description of work:

Corrects the icons/ path for work done as part of renaming the repository, having moved the package to src/. The anaconda package will now include the icons.

Check all that apply:

• added release notes
  (if not, provide an explanation in the work description)
• updated documentation
• Source added/refactored
• Added unit tests
• Added integration tests

References:

• Links to IBM EWM items: 9006: [QuickNXS] Leftovers from the Renaming Event
• Links to related issues or pull requests:

Manual test for the reviewer

(instructions to set up the environment)

Check list for the reviewer

• release notes updated,
  or an explanation is provided as to why release notes are unnecessary
• best software practices
  • clearly named variables (better to be verbose in variable names)
  • code comments explaining the intent of code blocks
• All the tests are passing
• The documentation is up to date
• code comments added when explaining intent

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.44%. Comparing base (2970ac4) to head (48cb0ed).

Additional details and impacted files

@@           Coverage Diff           @@
##             next     #136   +/-   ##
=======================================
  Coverage   60.44%   60.44%           
=======================================
  Files          34       34           
  Lines        6581     6581           
=======================================
  Hits         3978     3978           
  Misses       2603     2603           

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[mpatrou]

It looks good to me!