Correct polarisation sum for gluon

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Coverage summary from Codacy

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Coverage variation	Diff coverage
✅ +2.06% (target: -1.00%)	✅ 87.69%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (23b259f)	759	584	76.94%
Head commit (10723a0)	819 (+60)	647 (+63)	79.00% (+2.06%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#44)	130	114	87.69%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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