Update the details summary polyfill
Update the details summary polyfill

This updates the details summary to match PR #97 from GOV.UK elements -
Fixes for the details summary polyfill.

dwpdigitaltech/ejs-prototype,danblundell/verify-local-patterns,alphagov/govuk_prototype_kit,dwpdigitaltech/ejs-prototype,nhsbsa/ppc-prototype,hannalaakso/accessible-timeout-warning,OrcaTom/dwp_contentpatterns,paulpod/invgov,arminio/govuk_prototype_kit,tsmorgan/marx,companieshouse/ch-accounts-prototype,DilwoarH/GDS-Prototype-DM-SavedSearch,BucksCountyCouncil/verify-local-patterns,glancyea/tagtest,OrcaTom/dwp_contentpatterns,dwpdigitaltech/digital-debt,tsmorgan/marx,davedark/proto-timeline,gup-dwp/pip-prototype-v2,gup-dwp/pip-prototype-v2,arminio/govuk_prototype_kit,abbott567/govuk_prototype_kit,Demwunz/esif-prototype,paulpod/invgov,nhsbsa/ppc-prototype,quis/notify-public-research-prototype,joelanman/govuk_prototype_kit,rivalee/local-gov-links,joelanman/govuk_prototype_kit,BucksCountyCouncil/verify-local-patterns,rivalee/local-gov-links,abbott567/govuk_prototype_kit,BucksCountyCouncil/verify-local-patterns,samwake/hoddat-cofc-caseworking,dwpdigitaltech/digital-debt,karlparton/my-govuk,gavinwye/govuk_prototype_kit,dwpdigitaltech/hrt-prototype,DilwoarH/GDS-Prototype-DM-SavedSearch,karlparton/my-govuk,dwpdigitaltech/hrt-prototype,LandRegistry/dmp-prototype,davedark/proto-timeline,tsmorgan/marx,dwpdigitaltech/ejs-prototype,danblundell/verify-local-patterns,glancyea/tagtest,DilwoarH/GDS-Prototype-DM-SavedSearch,dwpdigitaltech/digital-debt,hannalaakso/accessible-timeout-warning,chrishanes/pvb_prisoner_proto,dwpdigitaltech/hrt-prototype,alphagov/govuk_prototype_kit,quis/notify-public-research-prototype,kenmaddison-scc/verify-local-patterns,karlparton/my-govuk,LandRegistry/dmp-prototype,glancyea/tagtest,abbott567/govuk_prototype_kit,kenmaddison-scc/verify-local-patterns,benjeffreys/hmcts-idam-proto,Demwunz/esif-prototype,quis/notify-public-research-prototype,samwake/hoddat-cofc-caseworking,LandRegistry/dmp-prototype,companieshouse/ch-accounts-prototype,kenmaddison-scc/verify-local-patterns,joelanman/govuk_prototype_kit,OrcaTom/dwp_contentpatterns,davedark/proto-timeline,benjeffreys/hmcts-idam-proto,gup-dwp/pip-prototype-v2,Demwunz/esif-prototype,hannalaakso/accessible-timeout-warning,chrishanes/pvb_prisoner_proto,arminio/govuk_prototype_kit,danblundell/verify-local-patterns,chrishanes/pvb_prisoner_proto,gavinwye/govuk_prototype_kit,alphagov/govuk_prototype_kit,paulpod/invgov,benjeffreys/hmcts-idam-proto,samwake/hoddat-cofc-caseworking,nhsbsa/ppc-prototype