Sqlite: Add a dtor to Database

The base class TransactionInterface has a virtual destructor that is not
exported. This means we get linker errors when trying to use Database in
a different library.

Change-Id: Iba431a627dca32d59ea7316b7f3eb07fa209c60f
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/libs/sqlite/sqlitedatabase.h

@@ -48,6 +48,7 @@ public:
 
     Database();
     Database(Utils::PathString &&databaseFilePath, JournalMode journalMode=JournalMode::Wal);
+    ~Database();
 
     Database(const Database &) = delete;
     bool operator=(const Database &) = delete;