Fix Android clip downloading

[NickM-27]

So turns out the iOS userAgent has a space but the Android userAgent doesn't. I tested this and the Android download button works as expected however the iOS button doesn't seem to work (nothing happens). I am wondering if the blank page doesn't work the same for iOS?

Fix for #241

[dermotduffy]

Thanks @NickM-27 . I have no way to test on iOS sadly. I think you're saying this 'add a space' fix words for Android, but iOS still doesn't work even with this PR? Don't suppose iOS works the fancier way? (i.e. the codepath without the _blank)?

[NickM-27]

Thanks @NickM-27 . I have no way to test on iOS sadly. I think you're saying this 'add a space' fix words for Android, but iOS still doesn't work even with this PR? Don't suppose iOS works the fancier way? (i.e. the codepath without the _blank)?

Right, for some reason the user agent format differs between platforms. I just tested this and unfortunately it appears as though the fancy code block also doesn't work for iOS. I wonder if there are any other cards that offer similar functionality that might offer some insights.

Interesting, the surveillance-card has this for their download functionality: "Note: This functionality is not available in native app versions (iOS & Android) and depends on the browser/device's ability to download image files."

[NickM-27]

In any case, this fixes #241 so should be good either way.