Changed the indicator icon and set it to overlay the bar.
Original mod: https://wago.io/platerquesticon
CUSTOM ICON (Blue version): (Ignore this if you're happy using Blizzard style icon.)
https://www.dropbox.com/s/m4qrp4m020m3zp4/PortraitQuestBadge.blp
To use the custom icon:
Exit game, download this file and place it into Interface\TARGETINGFRAME folder. If the folder doesn't exist, create it. Overwrite if prompted.