[TIMOB-26250] Android: Allow activity "android:launchMode" to be set in "tiapp.xml"
[TIMOB-26250] Android: Allow activity "android:launchMode" to be set in "tiapp.xml"

- Reverses change made in 6.1.0 where "launchMode" setting was ignored.
- Now allows it to be set due to customer demand, but keeps build warning recommending that it should not be used.

mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile,mano-mykingdom/titanium_mobile