Unreadable EPG time selection in bright theme

[cweiske]

The new material design with the bright/white theme has two issues:

1. The EPG search time settings (date + time selection) are not visible because the background is white, and the text is white. When scrolling down, the text is a bit more readable.
2. The EPG search text filter field has black text, which does not really match the theme (input field text should be white)

This is with dreamdroid 1.9.451 (f-droid) on a Nexus 7 tablet (flox) with LineageOS 18.1 (Android 11).

Screenshots demonstrating the problems:

• dreamdroid-1-epg-timesettings: https://user-images.githubusercontent.com/59036/216111521-abe5ac9d-48e5-4a34-9378-b17c1894f60b.png
• dreamdroid-2-epg-timesettings-scroll: https://user-images.githubusercontent.com/59036/216111530-52ae8329-cbfb-4cff-8300-c0ce952f4f86.png
• dreamdroid-3-epg-search: https://user-images.githubusercontent.com/59036/216111534-01b6b2d2-3c63-4b48-9e02-c3b0276f7ce1.png
• dreamdroid-4-epg-search-text2: https://user-images.githubusercontent.com/59036/216111542-19dbbf54-758d-4a6b-93ab-eaa2093f2d4c.png