cipher: Fix leak and database being locked when opening a normal DB file

Fix a memory leak and make sure the database is being fully unlocked
when opening a normal, not-enrypted database file.

src/sqlitedb.cpp

@@ -105,6 +105,7 @@ bool DBBrowserDB::open(const QString& db)
             return false;
 #endif
         } else {
+            sqlite3_finalize(vm);
             done = true;
         }
     } while(!done);