Revert "Revert "TRDS: Darker Keyboard""

This reverts commit 4bd3ffe02286cd9fc928bdc6f7cdf5510398f2b4.
Revert "Revert "LatinIME: make secondary chars better visible at TRDS dark keyboard""

This reverts commit 5671996ff288daec188f8ca9abc8774af563ff27.