Band-aid fix, switch default repository in multi_timed_run to be mozilla-central rather than tracemonkey.
Band-aid fix, switch default repository in multi_timed_run to be mozilla-central rather than tracemonkey.

MozillaSecurity/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,nth10sd/funfuzz