Default to not select iFrame oly tracks.

Pull in change to default to not use i-Frames for base AdaptiveTrackSelection.
The expectation is a subclases, that support transitioning to iFrame, will select these tracks.

library/core/src/main/java/com/google/android/exoplayer2/trackselection/AdaptiveTrackSelection.java

@@ -541,16 +541,10 @@ public class AdaptiveTrackSelection extends BaseTrackSelection {
   protected boolean canSelectFormat(
       Format format, int trackBitrate, float playbackSpeed, long effectiveBitrate) {
 
-    boolean isIframeOnly = (format.roleFlags & C.ROLE_FLAG_TRICK_PLAY) != 0;
+    boolean isNonIframeOnly = (format.roleFlags & C.ROLE_FLAG_TRICK_PLAY) == 0;
     boolean canSelect = Math.round(trackBitrate * playbackSpeed) <= effectiveBitrate;
 
-    if (Math.abs(playbackSpeed) > 6.0f) {
-      canSelect = isIframeOnly;   // TODO factor in playback speed...
-    } else {
-      canSelect = ! isIframeOnly && canSelect;
-    }
-    return canSelect;
-
+    return canSelect && isNonIframeOnly;    // Default is not to use the IDR only tracks in selection
   }
 
   /**