[TIMOB-24842] Android: Fix Ti.UI.View.opacity property change

[garymathews]

• Fix Titanium.UI.View opacity property change
• Remove redundant code

TEST CASE

var win = Ti.UI.createWindow({backgroundColor: 'gray'}),
    view = Ti.UI.createView({
        backgroundColor: 'blue', width: 200, height: 200
    });

view.addEventListener('click', function(e) {
	view.opacity = 0.5;
});

win.add(view);
win.open();

JIRA Ticket

[ypbnv]

CR: Pass

[ssjsamir]

FR passed: Was able to see the opacity change when clicking on the blue square.

Test Steps

• Downloaded the SDK Build form this PR
• Created a new Titanium project
• Copied the the test case from description

var win = Ti.UI.createWindow({backgroundColor: 'gray'}),
    view = Ti.UI.createView({
        backgroundColor: 'blue', width: 200, height: 200
    });

view.addEventListener('click', function(e) {
	view.opacity = 0.5;
});

win.add(view);
win.open();

• Ran the application
• Pressed the blue square
• Saw the opacity decrease

Test Environment
Appcelerator Command-Line Interface, version 6.2.2
Google Nexus 6P (7.1.1)
Operating System Name: Mac OS X El Capitan
Operating System Version: 10.11.6
Node.js Version: 6.10.1
Xcode: 8.2
Appcelerator Studio: 4.9.0.201705251638