Revert "Remove Nexus 5 from FTL targets"

This reverts commit 3b3f21f24160c82485af26598bcdc90769b89e43.

Reason for revert: Giving Nexus 5 another chance since it caught a bug with the "Done" button being pushed off the bottom of the screen. 

Change-Id: If07a4f102d1755741e8950d17272e79baa89b040

kokoro/build.sh

@@ -19,7 +19,7 @@ set -e
 # Display commands to stderr.
 set -x
 
-deviceIds=${1:-'Pixel2,Pixel3'}
+deviceIds=${1:-'Nexus5,Pixel2,Pixel3'}
 osVersionIds=${2:-'23,27,30'}
 
 GRADLE_FLAGS=()