Sqlite: Use exclusive lock for table initialization

We cannot change tables if other connections access the database.

Change-Id: I1915ab491952d9684cb9839957c84c8f7a15c308
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

src/libs/sqlite/sqlitedatabase.cpp

@@ -164,7 +164,7 @@ void Database::execute(Utils::SmallStringView sqlStatement)
 void Database::initializeTables()
 {
     try {
-        ImmediateTransaction transaction(*this);
+        ExclusiveTransaction transaction(*this);
 
         for (Table &table : m_sqliteTables)
             table.initialize(*this);