Fix can_edit_tree instance meta permission

[jwalgran]

Overview

The Android application checks the value of the can_edit_tree instance meta permission and does not PUT changes to the API if it has a value of false. This meta permission was incorrectly looking only at plot fields. This resulted in members of a role that could only edit tree fields being prevented from saving any tree changes.

Connects https://github.com/OpenTreeMap/otm-clients/issues/446

Notes

The can_edit_tree instance meta permission is not used by the web app or the iOS app, so the effect of this change is limited.

Testing Instructions

Setup

• Ensure that you can run the Android application and have it connect to your development OTM environment.
• Ensure that you have 2 separate user accounts set up.
• Log in as "user A," browse http://localhost:6060/create, and create an instance named sdtest.
• Browse http://localhost:6060/sdtest/management/roles/ and create a "Tree Steward" role.
  • Allow "Full Write Access" to "Date Planted" and "Stewardship" under "Tree Permissions." for the "Tree Steward" role.
  • Do NOT allow any planting site permissions

• Browse http://localhost:6060/sdtest/management/user-roles/ and invite "User B" to the instance by email address.
• Click "Edit," change the role for "User B" to "Tree Steward" and click "Save.
• Click "Add a tree" and add a single tree to the instance with a diameter and species.

Test

• Check out the master branches of the application.
• Log into the Android app as "User B" and select the sdtrees instance.
• Select the single tree, click "EDIT," change the "Date Planted," and click "SAVE"
• Verify that a saving spinner is NOT shown. Browse the tree detail page on the website and verify that the change was not saved.
• Check out this PR branch
• In the Android app use the Profile tab to switch treemap, but return to the sdtrees instance (this ensures that the permissions are reloaded.
• Repeat the process of using the Android app to change the "Date Planted" and verify that the process now works.

[coveralls]

Coverage increased (+0.001%) to 83.798% when pulling a5065b601fd237ed68a49142947bf65da9273738 on jcw/tree-edit-perm into aaed97e1d7c61d59289473049669ff84d04378ac on hotfix/2.21.6.

[jwalgran]

Thanks for the review