noosfero | block-design: remove redundant close button on block help (!1036)

[Rodrigo Souto]

Merge Request !1036 was merged
Merge Request url: https://gitlab.com/noosfero/noosfero/merge_requests/1036
Project:Branches: diguliu/noosfero:block-help-menu to noosfero/noosfero:master
Author: Rodrigo Souto
Assignee: 
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