patches/applescript: add select command to tabs in applescript

[nmggithub]

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This should fix imputnet/helium/issues/309. It's actually a fairly trivial change.

Upon reading the issue closer, it seems the original desire for this feature was spurred on by @IslamTayeb (reporter) experiencing behavior where the activate command would not switch switch to the space where the Helium window was. I, personally, am not experiencing that behavior on my end. However, as the issue quickly became about the adding the select command (and because I think this is a useful feature), I am still opening this PR.

[IslamTayeb]

so cool, thanks for this!

I'll check this within the week

[nmggithub]

@IslamTayeb just checking in! what are your thoughts on this?

[nmggithub]

@IslamTayeb @wukko Just bumping this to see what can be done.