D21141: Port ExternalPartStorage::self to C++11 singleton syntax.

[David Faure]

dfaure created this revision.
dfaure added a reviewer: dvratil.
dfaure requested review of this revision.

REVISION SUMMARY
  Much simpler, and fixes a strange asan error about sInstance violating
  ODR because defined twice in the test binary (which didn't seem right to me).

TEST PLAN
  externalpartstoragetest now passes in the ASAN build

BRANCH
  itemretriever (branched from Applications/19.04)

REVISION DETAIL
  https://phabricator.kde.org/D21141

AFFECTED FILES
  src/private/externalpartstorage.cpp
  src/private/externalpartstorage_p.h

To: dfaure, dvratil
Cc: kde-pim
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