Fix issues induced by android:drawableTint at API level <= 23

[rudmannn]

Describe the bug
Hi,

I went through your app code and found the usages of android:drawableTint in the file fragment_about_us.xml. When running your app at API level <= 23, such an attribute cannot take any effects and induce compatibility issues

To Reproduce
Devices on API level 22
Steps to reproduce the behavior:

1. Login the app
2. Click on 'menu' button on the left-top side
3. Scroll down to 'About Us'
4. See error

Expected behavior
Icons should be tinted in grey

Screenshots
API level 29

API level 22

To fix the issue, you can use app:drawableTint (located in androidx v1.1.0+) instead of android:drawableTint for backward compatibility.

Device Information (please complete the following information):

• Device: Android Emulator
• OS: Android 5.1