DolphinQt: Ignore "-psn" command line option on macOS

[OatmealDome]

On an application's first launch on macOS, a command line option matching the format "-psn_X_XXXXXX" is passed. This is to set the "ProcessSerialNumber", something used by the legacy Process Manager from Carbon. optparse recognizes it as an unknown option and immediately quits, so the application appears to crash.

This PR makes DolphinQt ignore the "-psn" command line option if it's found.

[OatmealDome]

Fixed lint (I think).

[BhaaLseN]

Is this guaranteed to be the last argument being passed? Like, does it also happen if you happen it for the first time using a command line argument like a DOL or so to run? Or does that only happen from Finder (being passed on first run)?

[OatmealDome]

Is this guaranteed to be the last argument being passed?

There's no documentation for this argument that I can find, so I can't definitively say that this is true. However, from what I can tell, whenever it does appear in the arguments list it is always the sole one. If you try and pass arguments on the first run (for example, open -a Dolphin.app --args file.dol), it doesn't get included.

Like, does it also happen if you happen it for the first time using a command line argument like a DOL or so to run? Or does that only happen from Finder (being passed on first run)?

It does not appear if you run the executable directly from the command line. Instead, it appears to be added when the application is opened via LaunchServices (via the Finder, open without --args, AppleScript, etc).