BHV-10740: Add netcast platform to enyo platform detection

### Issue:
The user agent string of Netcast apps were not being detected as webos platform apps, even though they run within WAM on the webOS tv. The user agent string is:
"Mozilla/5.0 (Web0S; Linux/SmartTV) AppleWebKit/537.41 (KHTML, like Gecko) Large Screen Safari/537.41 LG Browser/7.00.00(LGE; WEBOS1; 01.00.95; 1); webOS.TV-2014; LG NetCast.TV-2013 Compatible (LGE, WEBOS1, wired)"

### Fix:
The older webOS devices have UA strings of form webOS/(\d+) or hpwOS/(\d+) . Matching "webOS." seems like the most generic phrase to match, without matching the older webOS devices.

Enyo-DCO-1.1-Signed-off-by: Krishna Rangarajan <krishna.rangarajan@lge.com>