Sqlite: Remove virtual interface dependency

With C++ 17 it is possible to deduce the template argument from the
contructor parameter(CTAD). We then do not call anymore a virtual
function but a normal function.

Change-Id: I61c3ce22322c66b256afab278e768014401b08cc
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/libs/sqlite/sqlitedatabase.h

@@ -163,7 +163,6 @@ public:
     void lock() override;
     void unlock() override;
 
-private:
     void deferredBegin() override;
     void immediateBegin() override;
     void exclusiveBegin() override;
@@ -173,6 +172,7 @@ private:
     void sessionCommit() override;
     void sessionRollback() override;
 
+private:
     void initializeTables();
     void registerTransactionStatements();
     void deleteTransactionStatements();