Wrong user context when starting musicbee directly from installer

[alfred.yondraschek]

Actions to reproduce the bug:
-MusicBee Database on a network drive
-Upgrading to MusicBee 3.3.7367 via MusicBeeSetup_3_3_Update5.exe.
-Choosing "launch musicbee" at the end of the install process

--> MusicBee is started under the administrator account, so it can't find the database on the network drive. User is prompted to add a different path and to rebuild the database.

Closing and starting normally --> everything is fine

The option "launch musicbee" at the end of the install process must be changed: MusicBee must be started in the normal user context, not in an admin context.

[Steven]

This probably explains some of the weird permissions problems to the music library folder that some people report. There doesnt seem to be an easy answer to this with NSIS installer though, so for the next release I am going to remove the launch checkbox for the standard installer which must be elevated to an admin process for installation of program files