Update co-ex face failure message

Suggest to the user to use their fp sensor.

Test: atest KeyguardIndicationControllerTest
Test: enroll fingerprint and a different face. Then attempt
to authenticate with face, and receive a failure (matcher must run and not
recognize face). Observe two messages: "Can't recongize face" and
then, "Use fingerprint instead"
Fixes: 231382377

Change-Id: Ie969e0b1403a530ac589a8a121581656977c82a7
diff --git a/packages/SystemUI/res-keyguard/values/strings.xml b/packages/SystemUI/res-keyguard/values/strings.xml
index 8fa2204..d90156d 100644
--- a/packages/SystemUI/res-keyguard/values/strings.xml
+++ b/packages/SystemUI/res-keyguard/values/strings.xml
@@ -217,7 +217,7 @@
      the force lock button. [CHAR LIMIT=80] -->
     <string name="kg_prompt_reason_user_request">Device was locked manually</string>
 
-    <!-- Face hint message when finger was not recognized. [CHAR LIMIT=20] -->
+    <!-- Face hint message when face was not recognized. [CHAR LIMIT=20] -->
     <string name="kg_face_not_recognized">Not recognized</string>
 
      <!-- Error message indicating that the camera privacy sensor has been turned on [CHAR LIMIT=53] -->