fix(ios): allow music-player in MediaPlayer import (8.0.1+ regression)

[hansemannn]

JIRA: https://jira.appcelerator.org/browse/TIMOB-27106

[build]

	Fails
🚫	🔬 There are library changes, but no changes to the unit tests. That's OK as long as you're refactoring existing code, but will require an admin to merge this PR. Please see README.md#unit-tests for docs on unit testing.

	Warnings
⚠️	🔍 Can't find junit reports at ./junit.*.xml, skipping generating JUnit Report.

	Messages
📖	👍 Hey!, You deleted more code than you added. That's awesome!
📖	🎉 Another contribution from our awesome community member, hansemannn! Thanks again for helping us make Titanium SDK better. 👍

Generated by 🚫 dangerJS against fd65485

[vijaysingh-axway]

CR passed.

[ssjsamir]

FR Passed: MediaPlayer import now works again.

Tested with the following test case:

var win = Ti.UI.createWindow({
backgroundColor: 'white'
});
win.open();
win.addEventListener('open', function() {
Titanium.Media.openMusicLibrary();
});

Test Environment

iPhone 6S plus (12.2 Sim)
APPC CLI: 7.0.12-70X.4
Operating System Name: Mac OS Mojave
Operating System Version: 10.14.2
Node.js Version: 8.11.3
Xcode 10.2.1