Function Dialog: cannot delete parameter on ipad

[jwunderl]

Describe the bug

when editing a function, clicking into the field for a parameter gives a trash icon above it to remove the parameter on desktop. On IOS, we pop up a 'Change Value:' modal when you click in to pop up the soft keyboard -- this hides the trash can so parameters cannot be removed from functions on ipad

To Reproduce Steps to reproduce the behavior:

1. Go to arcade on ipad
2. create a project
3. create a function, add a parameter
4. try to remove the parameter
5. see error

Expected behavior

either get by without the extra modal, or add a trash can as an alternate button on the modal