[melodic-devel] change FloatingJointModel::getStateSpaceDimension return value to 7

[tylerjw]

Description

Backport of bugfix from #2031

@v4hn asked for this here: #2066

I didn't include the test that came with this. LMK if you think I should backport that too.

[codecov-commenter]

Codecov Report

Merging #2106 into melodic-devel will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@                Coverage Diff                @@
##           melodic-devel    #2106      +/-   ##
=================================================
- Coverage          51.82%   51.80%   -0.03%     
=================================================
  Files                320      320              
  Lines              24459    24459              
=================================================
- Hits               12677    12670       -7     
- Misses             11782    11789       +7     

Impacted Files	Coverage Δ
...veit_core/robot_model/src/floating_joint_model.cpp	48.35% <100.00%> (ø)
.../ompl_interface/src/detail/constrained_sampler.cpp	46.15% <0.00%> (-17.95%)	⬇️

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