It's not hard to spot. It looks OK. It's straight and comes in contact by the force of it's springiness with only the central trace of the micro PCB in the HS.
Bridging the traces just means to re-flow them with molten solder instead of the old copper on the original trace that appears worn out. Sometimes, if
you can't spread enough solder over a long stretch of old trace with a soldering iron, it's easier to solder a thin capacitor lead over the old trace to fix
it. You should first test to check if it's really worn out or just appears that way.
Here, I marked one of the 5 traces for you. The yellow rectangle shows how the central trace is connected with the right channel's ground/shield trace.
For all intents and purposes, it grounds the HS, and the entire TA. Remember the traces are what comes in contact with the headshell sled 4 springy pins.
Those pins should also be cleaned and checked for continuity all the way to the cart pins.