Clang: Fix reset for write and execute in the sqlite statement

We were not reset a statement if we got an exception. There are now test
for it.

Change-Id: Ife7b4437fece9369767605ba7387bd0564c1bb8d
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/libs/sqlite/sqlitetransaction.h

@@ -64,6 +64,7 @@ public:
     {
         m_interface.commit();
         m_isAlreadyCommited = true;
+        m_locker.unlock();
     }
 
 protected:
@@ -76,7 +77,7 @@ protected:
 
 protected:
     TransactionInterface &m_interface;
-    std::lock_guard<TransactionInterface> m_locker{m_interface};
+    std::unique_lock<TransactionInterface> m_locker{m_interface};
     bool m_isAlreadyCommited = false;
     bool m_rollback = false;
 };