[sldev] [Patch] Mini-map bug fixes for Snowglobe

[Aimee Trescothick]

Here's a couple of fairly straight forward small mini-map bug fixes to  
get things rolling.


http://jira.secondlife.com/browse/SNOW-67 (VWR-4106)
Fixes the display of the tracking beacon on the mini-map when it is  
above or below the camera.

http://jira.secondlife.com/browse/SNOW-68 (VWR-13227)
Prevents the text labels on the mini-map incorrectly displaying as  
black when using the silver skin.


I would appreciate it if someone (or a couple of people) could review  
these so that I can commit them to Snowglobe.

Aimee.