[TIMOB-24371] UniversalWindowsApp: Textfield's return event fires twice

Problem Description:

Textfield's return event fires twice.

steps to reproduce:

Sample project: https://propelics.box.com/s/yn402w8nzteymhevzu1tv4amson8bonq 1.- Launch app 2.- Type anything in the textfield 3.- Hit return in keyboard 4.- Observe console will print "return event" twice.

Actual results:

In console log, we see two events being logged after we click on write text on textfield and click on return.

Expected Result:

Single click on return on keyboard should fire only one event.