Add password visibitly toggle to login screen.

Fixes commons-app#1218

Author: knight-shade

app/src/main/res/layout-land/activity_login.xml

@@ -98,7 +98,7 @@
                     android:layout_marginLeft="@dimen/standard_gap"
                     android:layout_marginRight="@dimen/standard_gap"
                     android:layout_marginStart="@dimen/standard_gap"
-                    app:passwordToggleEnabled="false">
+                    app:passwordToggleEnabled="true">
 
                     <android.support.design.widget.TextInputEditText
                         android:id="@+id/loginPassword"

app/src/main/res/layout-xlarge/activity_login.xml

@@ -121,7 +121,7 @@
                     android:layout_marginRight="@dimen/standard_gap"
                     android:layout_marginStart="@dimen/standard_gap"
                     android:visibility="gone"
-                    app:passwordToggleEnabled="false"
+                    app:passwordToggleEnabled="true"
                     tools:visibility="visible">
 
                     <android.support.design.widget.TextInputEditText

app/src/main/res/layout/activity_login.xml

@@ -117,7 +117,7 @@
                     android:layout_marginLeft="@dimen/standard_gap"
                     android:layout_marginRight="@dimen/standard_gap"
                     android:layout_marginStart="@dimen/standard_gap"
-                    app:passwordToggleEnabled="false">
+                    app:passwordToggleEnabled="true">
 
                     <android.support.design.widget.TextInputEditText
                         android:id="@+id/loginPassword"