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abort: removed labels argument from abortmerge()

Authored by taapas1128.

Description

abort: removed labels argument from abortmerge()

Labels are used to label the code that belongs to working copy and merge rev
in case of a conflicted state.
No such labelling is required while aborting merge as conflicted parts
are reverted to normal.

Differential Revision: https://phab.mercurial-scm.org/D6638