frontend-tools: Update clock Lua script for new gs_image_file_ex

[RytoEX]

Description

Follow-up to c3046ec (#11178).

That commit completely replaced the various gs_image_file* structs and functions, but this script was not updated. Use the new structs and functions to fix the script.

Motivation and Context

Want the bundled scripts to work.

How Has This Been Tested?

Tested on Windows 11. Does not require an OBS Studio rebuild. Just load the updated script in OBS Studio.

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• I have read the contributing document.
• My code has been run through clang-format.
• My code follows the project's style guidelines
• My code is not on the master branch.
• My code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[Fenrirthviti]

Tested on 33.0.0 Beta5 and the error is corrected and the source works as expected.

[exeldro]

Should the Lua script move to gs_texture_create_from_file instead? as it does not support animated gifs at the moment

[RytoEX]

Should the Lua script move to gs_texture_create_from_file instead? as it does not support animated gifs at the moment

This is a valid question that I do not have an answer for. Right now the script is broken, and I just wanted it to be back in a working state.