IsPlayInMobilePreview does not return true when using Mobile Preview

A user has reported that the IsPlayInMobilePreview function does not return true when playing in Mobile Preview. From looking at the function, it seems to be looking specifically for the commandline argument "simmobile" which may not get used when using Mobile Preview through the usual workflow to do so with PIE.

Regression?: No
This occurred in 4.21

1. Download the attached project and generate project files / compile it
2. Open the project
3. Press play
4. Note that the print string says False as you are not in Mobile Preview
5. Click the dropdown beside play and start "Mobile Preview ES2 (PIE)"
   Result: The print string still prints false, although you are in Mobile Preview
   Expected: The print string prints true.

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