Remove temporary padding once HS chat bubble is draggable

[Steve-Mcl]

Still waiting feedback: https://community.hubspot.com/t5/HubSpot-Ideas/More-Chat-Widget-Styling-Options/idc-p/1034107/highlight/true#M192193

Originally posted by @Steve-Mcl in https://github.com/FlowFuse/flowfuse/issues/2897#issuecomment-2337300431