Not sure how the icon-path hook works, but the declared icon in notes-app’s manifest file is "notepad", and the icons exists in ubuntu-mobile-icons:
$ dpkg -L ubuntu-mobile-icons | grep notepad /usr/share/icons/ubuntu-mobile/apps/240/notepad.png /usr/share/icons/ubuntu-mobile/apps/144/notepad.png /usr/share/icons/ubuntu-mobile/apps/scalable/notepad.svg
Not sure how the icon-path hook works, but the declared icon in notes-app’s manifest file is "notepad", and the icons exists in ubuntu- mobile- icons:
$ dpkg -L ubuntu-mobile-icons | grep notepad icons/ubuntu- mobile/ apps/240/ notepad. png icons/ubuntu- mobile/ apps/144/ notepad. png icons/ubuntu- mobile/ apps/scalable/ notepad. svg
/usr/share/
/usr/share/
/usr/share/