Fix CWB BBH citation for sky maps

Looking at an example superevent (https://gracedb-test.ligo.org/superevents/S240612t/view/) that includes both CWB AllSky and CWB BBH, we see that it uses the first for the citation of the sky map even though the sky map was created by the latter.

SUBJECT: LIGO/Virgo/KAGRA S240612t: Identification of a GW unmodeled transient candidate

The LIGO Scientific Collaboration, the Virgo Collaboration, and the KAGRA
Collaboration report:

We identified the unmodeled transient candidate S240612t during real-time
processing of data from LIGO Hanford Observatory (H1) and LIGO Livingston
Observatory (L1) at 2024-06-12 13:00:28.435 UTC (GPS time: 1402232446.435). The
candidate was found by the cWB [1], cWB BBH [2], and GstLAL [3] analysis
pipelines.

S240612t is an event of interest because its false alarm rate, as estimated by
the online analysis, is 3.1e-08 Hz, or about one in 1 year, 12 days. The
event's properties can be found at this URL:

https://gracedb-test.ligo.org/superevents/S240612t

The classification of the GW signal, in order of descending probability, is BBH
(51%), Terrestrial (49%), BNS (<1%), or NSBH (<1%).

Assuming the candidate is astrophysical in origin, the probability that the
lighter compact object is consistent with a neutron star mass (HasNS) is <1%.
[4] Using the masses and spins inferred from the signal, the probability of
matter outside the final compact object (HasRemnant) is <1%. [4] Both HasNS and
HasRemnant consider the support of several neutron star equations of state. The
probability that either of the binary components lies between 3 and 5 solar
masses (HasMassGap) is <1%.

Two sky maps are available at this time and can be retrieved from the GraceDB
event page:
 * cwb.multiorder.fits,0, an initial localization generated by cWB [1],
distributed via GCN notice about a minute after the candidate event time.
 * cwb.multiorder.fits,1, an initial localization generated by cWB [1],
distributed via GCN notice about 6 minutes after the candidate event time.

The preferred sky map at this time is cwb.multiorder.fits,1. For the
cwb.multiorder.fits,1 sky map, the 90% credible region is 2468 deg2.

For further information about analysis methodology and the contents of this
alert, refer to the LIGO/Virgo/KAGRA Public Alerts User Guide
https://emfollow.docs.ligo.org/.

 [1] Klimenko et al. PRD 93, 042004 (2016) doi:10.1103/PhysRevD.93.042004
 [2] T. Mishra et al. PRD 105, 083018 (2022) doi:10.1103/PhysRevD.105.083018
 [3] Tsukada et al. PRD 108, 043004 (2023) doi:10.1103/PhysRevD.108.043004 and
Ewing et al. (2023) arXiv:2305.05625
 [4] Chatterjee et al. ApJ 896, 54 (2020) doi:10.3847/1538-4357/ab8dbe