Interactive Window cell output find match isn't noticeable

[rzhao271]

1. In an interactive window, run the following:

for i in range(10):
    print(i)

2. Activate the find widget and change the find settings by clicking on the funnel so that the find widget searches in the cell output as well.
3. Search 3 and keep finding until it highlights the match in the cell output.
4. 🐛 The match is barely noticeable.

Ref #130587
Ref #161925

[rebornix]

Should be fixed now.