Remove incompatibility between VT and RTT

Don't unset the video telephony capability on a PhoneAccount when it's
also RTT capable -- the RTT capability is almost always on now for
devices that support it.

Bug: 144187006
Test: manual
Change-Id: I2cc2117f1c57c78db1a3a3a1ddc82e7a2290d12b
diff --git a/src/com/android/services/telephony/TelecomAccountRegistry.java b/src/com/android/services/telephony/TelecomAccountRegistry.java
index 6bbcdc4..0b7f3c0 100644
--- a/src/com/android/services/telephony/TelecomAccountRegistry.java
+++ b/src/com/android/services/telephony/TelecomAccountRegistry.java
@@ -286,7 +286,7 @@
                 mIsRttCapable = false;
             }
 
-            mIsVideoCapable = mPhone.isVideoEnabled() && !mIsRttCapable;
+            mIsVideoCapable = mPhone.isVideoEnabled();
             boolean isVideoEnabledByPlatform = ImsManager.getInstance(mPhone.getContext(),
                     mPhone.getPhoneId()).isVtEnabledByPlatform();