Fix issue with multiple chains

[gowerc]

Closes #201

Wasn't able to replicate the bug anymore. Must have been an issue with my session at the time. That being said I've added a unit test to show that we can still recover model estimates when using multiple chains

[github-actions]

Code Coverage Summary

Filename                       Stmts    Miss  Cover    Missing
---------------------------  -------  ------  -------  ----------------------
R/DataJoint.R                      8       0  100.00%
R/DataLongitudinal.R              71       0  100.00%
R/DataSurvival.R                  46       0  100.00%
R/defaults.R                      11       6  45.45%   27, 57-84, 111
R/generics.R                      12       1  91.67%   156
R/JointModel.R                    51       8  84.31%   85-99, 117-120
R/JointModelSamples.R             91       0  100.00%
R/Link.R                           6       0  100.00%
R/LinkGSF.R                       63      12  80.95%   109-120
R/LinkNone.R                       3       1  66.67%   36
R/LinkRandomSlope.R               10       0  100.00%
R/LongitudinalGSF.R               23       0  100.00%
R/LongitudinalModel.R             10       0  100.00%
R/LongitudinalRandomSlope.R       17       1  94.12%   43
R/LongitudinalSamples.R           15       0  100.00%
R/Parameter.R                     12       0  100.00%
R/ParameterList.R                 28       0  100.00%
R/Prior.R                         58       9  84.48%   127-135
R/simulations_gsf.R               43       0  100.00%
R/simulations_os.R                11       5  54.55%   35-39
R/simulations_rs.R                21       0  100.00%
R/simulations.R                   99       1  98.99%   122
R/StanModel.R                      7       0  100.00%
R/StanModule.R                   145       5  96.55%   186-187, 203, 236, 247
R/SurvivalExponential.R            9       0  100.00%
R/SurvivalLoglogistic.R           10      10  0.00%    31-40
R/SurvivalModel.R                 12       0  100.00%
R/SurvivalSamples.R               43       0  100.00%
R/SurvivalWeibullPH.R             10       0  100.00%
R/utilities.R                    116       1  99.14%   13
R/zzz.R                           10      10  0.00%    4-16
TOTAL                           1071      70  93.46%

Diff against main

Filename      Stmts    Miss  Cover
----------  -------  ------  --------
TOTAL             0       0  +100.00%

Results for commit: 603e814

Minimum allowed coverage is 80%

♻️ This comment has been updated with latest results

[github-actions]

Unit Tests Summary

    1 files    23 suites   4m 40s ⏱️
  59 tests   59 ✔️ 0 💤 0 ❌
215 runs  215 ✔️ 0 💤 0 ❌

Results for commit daa1ccc.