Rollback of https://github.com/google/ExoPlayer/commit/5e3022c48fbc345af751223271c7852beb48c5c4

*** Original commit ***

Target demo apps to API level 30

***

PiperOrigin-RevId: 380542402

constants.gradle

@@ -16,7 +16,7 @@ project.ext {
     releaseVersion = '2.14.1'
     releaseVersion = '2.14.1'
     releaseVersionCode = 2014001
     releaseVersionCode = 2014001
     minSdkVersion = 16
     minSdkVersion = 16
-    appTargetSdkVersion = 30
+    appTargetSdkVersion = 29
     targetSdkVersion = 30
     targetSdkVersion = 30
     compileSdkVersion = 30
     compileSdkVersion = 30
     dexmakerVersion = '2.28.1'
     dexmakerVersion = '2.28.1'