fix(android): drop-down picker text color for dark/light theme change

[jquick-axway]

JIRA:
https://jira.appcelerator.org/browse/TIMOB-28424

Summary:

• Default text color not changing after switching dark/light theme.
• Caused by storing default text color to a "static" variable. Changed to store to an instance member variable.

---

Dark/Light Theme Test:

1. Build the below on Android 10 or higher.
2. Verify you can see the text in the picker. (Dark text with light theme or light text with dark theme.)
3. Go to System Settings -> Display.
4. Toggle the Dark/Light theme switch.
5. Go back to the Titanium app.
6. Verify that the picker's text color has changed. (Used to use previous theme's text color.)

const window = Ti.UI.createWindow();
const rows = [];
for (let index = 1; index <= 5; index++) {
	rows.push(Ti.UI.createPickerRow({ title: `Item ${index}` }));
}
const picker = Ti.UI.createPicker({
	columns: [Ti.UI.createPickerColumn({ rows: rows })],
	width: "50%",
});
picker.addEventListener("change", (e) => {
	Ti.API.info(`@@@ Selected rowIndex: ${e.rowIndex}, rowTitle: "${e.row.title}"`);
});
window.add(picker);
window.open();

---

Custom Color Test:

1. Build and run the below on Android.
2. Tap on the picker.
3. Verify rows 1, 3, and 5 are green.
4. Verify rows 2 and 4 are red.

const window = Ti.UI.createWindow();
const rows = [];
for (let index = 1; index <= 5; index++) {
	rows.push(Ti.UI.createPickerRow({ title: `Item ${index}`, color: (index % 2) ? "green" : "orange" }));
}
const picker = Ti.UI.createPicker({
	columns: [Ti.UI.createPickerColumn({ rows: rows })],
	width: "50%",
});
picker.addEventListener("change", (e) => {
	Ti.API.info(`@@@ Selected rowIndex: ${e.rowIndex}, rowTitle: "${e.row.title}"`);
});
window.add(picker);
window.open();

[build]

	Messages
📖	✊ The commits in this PR match our conventions! Feel free to Rebase and Merge this PR when ready.
📖	✅ All tests are passing Nice one! All 14318 tests are passing. (There are 960 skipped tests not included in that total)
📖	💾 Here's the generated SDK zipfile.

Generated by 🚫 dangerJS against 41476c1

[garymathews]

CR: PASS

[lokeshchdhry]

FR Passed.