fix Pagination helper test class name

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012460
fix typo redcarpet requirement in lib/redmine.rb (#15520)

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012461
remove unneeded 'redmine/field_format' requirement from FieldFormatTest

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012462
remove unneeded including ApplicationHelper from helper tests

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extra : convert_revision : svn%3Ae93f8b46-1217-0410-a6f0-8f06a7374b81/trunk%4012463