remove implicit inheritance for shop=trade

[matkoniecz]

see #1813 and ideditor/schema-builder#204 (comment)

Description, Motivation & Context

see #1813

Related issues

related to #1813

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[matkoniecz]

tested on brand field that inheritance works

[tyrasd]

Looks good to me. Let's wait a couple of days so that others have a little more time to comment their opinion either here or on #1813 / ideditor/schema-builder#204.

[matkoniecz]

ideditor/schema-builder#204 (comment)