Update the snap targets in minimized mode to reflect the correct targets

In minimized mode there is only 1 split snap target compared to regular
portrait that has 30%, 50%, 70% targets. Update the accessibility options
for minimized mode to reflect the correct targets. Also removed the
middle target if there is only 1 split snap target.

Test: using talkback, see custom options on divider handle in minimized
mode
Fixes: 78304300

Change-Id: I8421499616cf0fe503c1f6a081a2151098640a9c

core/java/com/android/internal/policy/DividerSnapAlgorithm.java

@@ -370,6 +370,14 @@ public class DividerSnapAlgorithm {
         return snapTarget;
     }
 
+    /**
+     * @return whether or not there are more than 1 split targets that do not include the two
+     * dismiss targets, used in deciding to display the middle target for accessibility
+     */
+    public boolean showMiddleSplitTargetForAccessibility() {
+        return (mTargets.size() - 2) > 1;
+    }
+
     public boolean isFirstSplitTargetAvailable() {
         return mFirstSplitTarget != mMiddleTarget;
     }