Pass app context to the IMA SDK

Notes: this doesn't fix the current issue where the component containing the
ad overlay view leaks, but is good practice anyway.
PiperOrigin-RevId: 308582036

extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java

@@ -472,7 +472,9 @@ public final class ImaAdsLoader
     adCallbacks = new ArrayList<>(/* initialCapacity= */ 1);
     adDisplayContainer = imaFactory.createAdDisplayContainer();
     adDisplayContainer.setPlayer(/* videoAdPlayer= */ this);
-    adsLoader = imaFactory.createAdsLoader(context, imaSdkSettings, adDisplayContainer);
+    adsLoader =
+        imaFactory.createAdsLoader(
+            context.getApplicationContext(), imaSdkSettings, adDisplayContainer);
     adsLoader.addAdErrorListener(/* adErrorListener= */ this);
     adsLoader.addAdsLoadedListener(/* adsLoadedListener= */ this);
     fakeContentProgressElapsedRealtimeMs = C.TIME_UNSET;