Android: Tint color inconsistency

## Environment

```
React Native Environment Info:
System:
OS: macOS 10.14.5
CPU: (8) x64 Intel(R) Core(TM) i7-4850HQ CPU @ 2.30GHz
Memory: 1.16 GB / 16.00 GB
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 11.14.0 - ~/.nvm/versions/node/v11.14.0/bin/node
Yarn: 1.15.2 - ~/.yarn/bin/yarn
npm: 6.9.0 - ~/.nvm/versions/node/v11.14.0/bin/npm
Watchman: 3.9.0 - /usr/local/bin/watchman
SDKs:
iOS SDK:
Platforms: iOS 12.2, macOS 10.14, tvOS 12.2, watchOS 5.2
Android SDK:
API Levels: 23, 24, 25, 26, 27, 28
Build Tools: 23.0.1, 23.0.2, 23.0.3, 24.0.0, 25.0.0, 25.0.1, 25.0.2, 25.0.3, 26.0.1, 26.0.2, 26.0.3, 27.0.1, 27.0.2, 27.0.3, 28.0.3
System Images: android-19 | Google APIs Intel x86 Atom, android-23 | Google APIs Intel x86 Atom, android-24 | Google APIs Intel x86 Atom, android-25 | Google Play Intel x86 Atom, android-26 | Google APIs Intel x86 Atom, android-26 | Google Play Intel x86 Atom, android-27 | Google APIs Intel x86 Atom, android-27 | Google Play Intel x86 Atom, android-28 | Google Play Intel x86 Atom
IDEs:
Android Studio: 3.4 AI-183.6156.11.34.5522156
Xcode: 10.2.1/10E1001 - /usr/bin/xcodebuild
npmPackages:
react: 16.8.3 => 16.8.3
react-native: 0.59.8 => 0.59.8
npmGlobalPackages:
react-native-cli: 2.0.1
react-native-git-upgrade: 0.2.7
```

## Description

When `maximumTintColor` matches `minimumTintColor`, Android overrides the colour setting and makes `maximumTintColor` lighter than `minimumTintColor`.

Also, something like below will be ignored as it appears that Android likes to paint a more visible shade on the minimum side.

```
{ minimumTrackTintColor: 'rgba(255,255,255,0.1)', maximumTrackTintColor: 'rgba(255,255,255,0.4)' }
```