Remove upload options for users who lack upload permission

[mchowning]

See the related gutenberg PR for a description and testing steps.

PR submission checklist:

• [X] I have considered adding unit tests where possible.
• [x] I have considered if this change warrants user-facing release notes more info and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile[bot]]

Wanna run full suite of Android and iOS UI tests? Click here and 'Approve' CI job!