Add module geometry to tt

I had forgotten the moduleGeometry(DetId) method a year or so ago in TrackerTopology. Adding it (Thanks to Vincenzo for noticing)
the other one will go away one a migration is completed

On Oct 12, 2014, at 4:04 PM, Slava Krutelyov <notifications@github.com>
 wrote:
> 
> this looks strikingly similar to SiStripDetId::ModuleGeometry SiStripDetId::moduleGeometry() const do we need a copy-paste?
> 
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