Update string displayed on work pin/password challenge

* The incorrect string was being displayed when the user
  was asked to enter their pin/password.
* Updated the string to include **work** instead of
  **device** when entering a work pin/password.

Bug: 148211118
Test: Manual testing
Change-Id: I2239a5011dec62fd63574bbf75495548ddd0d907

src/com/android/settings/password/ConfirmLockPattern.java

@@ -239,7 +239,7 @@ public class ConfirmLockPattern extends ConfirmDeviceCredentialBaseActivity {
                 return R.string.lockpassword_confirm_your_pattern_details_frp;
             }
             final boolean isStrongAuthRequired = isStrongAuthRequired();
-            if (UserManager.get(getActivity()).isManagedProfile(mEffectiveUserId)) {
+            if (mIsManagedProfile) {
                 return isStrongAuthRequired
                         ? R.string.lockpassword_strong_auth_required_work_pattern
                         : R.string.lockpassword_confirm_your_pattern_generic_profile;