PWA: Fix app manifest logo icon sizes

[abrahampm]

Logo icon 77.png does not exists so a warning is shown on Chrome Dev Tools when inspecting the PWA manifest.

Not sure if this is related with some users not getting the Install App button on Chrome. I came across this problem when trying to install the PWA on a mobile device and Install app button was not available so I decided to investigate. Hope this helps! ;)

Acceptance Criteria:

• Features and enhancements must be fully implemented so that they can be released at any time without additional work
• Automated unit and/or acceptance tests are mandatory to ensure the changes work as expected and to reduce repetitive manual work
• Frontend components must be responsive to work and look properly on phones, tablets, and desktop computers; you must have tested them on all major browsers and different devices
• Documentation and translation updates should be provided if needed
• In case you submit database-related changes, they must be tested and compatible with SQLite 3 and MariaDB 10.5.12+

[CLAassistant]

All committers have signed the CLA.

[lastzero]

Thank you very much! Must have been a typo...