D11972: [RenameDialog] Fix crash when renaming single items

[Elvis Angelaccio]

elvisangelaccio created this revision.
Restricted Application added a subscriber: Dolphin.
elvisangelaccio requested review of this revision.

REVISION SUMMARY
  `m_spinBox` is initialized only when renaming multiple items.
  
  This commit restores the single-item rename logic which was wrongly
  removed by commit c5eb4e31161ccf422 <https://phabricator.kde.org/R318:c5eb4e31161ccf422a2f2492fe998c5c9817bea4>.

TEST PLAN
  Disable inline renaming and try to renaming single or multiple items (and also to undo the jobs).

REPOSITORY
  R318 Dolphin

BRANCH
  Applications/18.04

REVISION DETAIL
  https://phabricator.kde.org/D11972

AFFECTED FILES
  src/views/renamedialog.cpp

To: elvisangelaccio
Cc: #dolphin
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