Use dedicated hotpot icon - thanks to novolife for the icon

[matkoniecz]

thanks to @novolife - see rapideditor/temaki#95

Description, Motivation & Context

Related issues

part of #41

#1569 was also by @novolife so I am going to assume they approve of this icon

Links and data

Relevant OSM Wiki links:

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Relevant tag usage stats:

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[matkoniecz]