Fix handling color mode of PointCloudShape in OSG

[jslee02]

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@dabcef0). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1316   +/-   ##
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  Coverage          ?   57.13%           
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  Files             ?      366           
  Lines             ?    27052           
  Branches          ?        0           
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  Hits              ?    15457           
  Misses            ?    11595           
  Partials          ?        0

Impacted Files	Coverage Δ
dart/dynamics/PointCloudShape.hpp	0% <ø> (ø)