Update imageviewer.js

[bluelovers]

Description

• a simple description of what you're trying to accomplish
• a summary of changes in code
• which issues it fixes, if any

Screenshots/videos:

Checklist:

• I have read contributing wiki page
• I have performed a self-review of my own code
• My code follows the style guidelines
• My code passes tests

[w-e-w]

Description

• a simple description of what you're trying to accomplish
• a summary of changes in code
• which issues it fixes, if any

[light-and-ray]

What happens here? 🤨

[w-e-w]

https://github.com/AUTOMATIC1111/stable-diffusion-webui/pulls?q=is%3Apr+author%3Abluelovers+
this guy pretty much never properly writes PR descriptions
at most a couple of screenshot or one line description

[light-and-ray]

I know there is a bug in full screen image view on mobile phones. If there are more then one image, the next image is opened every time. Maybe this pr is about it. Or if not, it's needed to fix btw

[bluelovers]

[AUTOMATIC1111]

i think doesn't fix anything but just makes the code smaller