Errors with dark mode

## Environment

Windows 10
Android 7
React native paper ^4.8.1

## Description

The theme changes everything to blue color whenever I change it to dark theme. The error texts are changed to white color and Issue in overall look of the application. The dark theme is combined from react navigation dark theme and react native paper dark theme.

## Reproducible Demo
1. clone the repo
2. Implement dark mode combining react navigation theme and react native paper theme
3. Look for the changes