Add input_x_selected_name Support for Photos Input (PR #285)

[Haavard15]

Describe the feature
I am proposing to add support for input_x_selected_name to the Photos input type, as seen in commit 571688b. This change allows users to retrieve the selected photo’s name by:

• Including the Photos input type in the selected index tracking.
• Adding a variable to capture the selected photo's name (input_x_selected_name).

Is this version dependent (vMix v24.)?
No

If documentation is required to implement, do you know where to find it?
N/A

Usecases
Having the name visible in the button so you can confirm the content before you press it

[thedist]

This is something we can add in to the 3.7.0 update, but what I would like for you to change with your PR is if you're going to add support for input_x_selected_name , to also support it in dynamic_input_x_selected_name , so that it matches how variables are handled for list inputs also giving variables for dynamic inputs.