BUG: Two browser console warnings

[JoelWiebe]

Bug

Overview
Two angular related browser console warnings occur and two issues during regular use

To Reproduce
Steps to reproduce first warning:

1. Go to the Canvas view of any project
2. Click on the + then the canvas to create a new post
3. When the Add Post modal pops up, the error will be displayed in the console

It looks like you're using ngModel on the same form field as formControl. Support for using the ngModel input property and ngModelChange event with reactive form directives has been deprecated in Angular v6 and will be removed in a future version of Angular.

Have not found how to resolve second warning:

Element matching '[cdkFocusInitial]' is not focusable. <button _ngcontent-krs-c42 type=​"submit" mat-button cdkfocusinitial class=​"mat-focus-indicator mat-button mat-button-base ng-star-inserted spinner mat-button-disabled" ng-reflect-disabled=​"true" style disabled=​"true">​…​​ focusInitialElement @ a11y.mjs:1093

Steps to reproduce two issues in browser

1. Open either the multi-assign tab of the group assignments or the manage workflow modal
2. See issues appear in developer tools:

Incorrect use of label for=FORM_ELEMENT