[TwitterBridge] Fix username matching to be case insensitive with noretweet option

[drklee3]

Makes username comparisons case insensitive with strtolower. This fixes the problem where all tweets are considered as a retweet if the input username is not cased the same as the actual username.

For example: aoc instead of the actual username AOC with no retweets turned on will return empty results.

[em92]

gj @drklee3 !

For example: aoc instead of the actual username AOC with no retweets turned on will return empty results.

This is reproducible if we turn on DEBUG mode, where caching is turned off in most cases. In my case I opened with aoc - it gave empty feed. Then I switched to AOC - it also gave empty feed. Turned on debug mode on my laptop, and it reproduced it there.