Support desktop touchscreens for timelines

[hawkeye217]

• Desktop touchscreens can fire a TouchEvent, so remove the isMobile check for dragging timeline handlebars
• Remove placeholder select dropdown in General settings
• Set max height on Settings cameras dropdown

[netlify]

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[deviant77]

This broke scrubbing through history for me in Firefox 125 on Linux, and gives the following errors in the developer console:

Uncaught ReferenceError: TouchEvent is not defined
    Q http://frigate:80/assets/SummaryTimeline-DWF-gQBS.js:1
    D http://frigate:80/assets/SummaryTimeline-DWF-gQBS.js:1
    yI http://frigate:80/assets/index-DU3HC9W5.js:38
    bI http://frigate:80/assets/index-DU3HC9W5.js:38
    _I http://frigate:80/assets/index-DU3HC9W5.js:38
    N4 http://frigate:80/assets/index-DU3HC9W5.js:38
    AE http://frigate:80/assets/index-DU3HC9W5.js:38
    vg http://frigate:80/assets/index-DU3HC9W5.js:38
    X2 http://frigate:80/assets/index-DU3HC9W5.js:41
    Q3 http://frigate:80/assets/index-DU3HC9W5.js:38
    vg http://frigate:80/assets/index-DU3HC9W5.js:38
    C2 http://frigate:80/assets/index-DU3HC9W5.js:38
    DI http://frigate:80/assets/index-DU3HC9W5.js:38
    NE http://frigate:80/assets/index-DU3HC9W5.js:38
    mg http://frigate:80/assets/index-DU3HC9W5.js:38
    Zu http://frigate:80/assets/index-DU3HC9W5.js:38
    Zu http://frigate:80/assets/index-DU3HC9W5.js:38
    createRoot http://frigate:80/assets/index-DU3HC9W5.js:41
    <anonymous> http://frigate:80/assets/index-DU3HC9W5.js:206
SummaryTimeline-DWF-gQBS.js:1:8208

Going back to ad87f57 fixed it.