SQL/ODBC: Don't allow default argument for SqlStmtHandle

To avoid usage errors like fixed with
7e5a0b54f0

Pick-to: 6.7
Change-Id: I33af9721a04e80541c027fa6da8630070a5957ac
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

src/plugins/sqldrivers/odbc/qsql_odbc.cpp

@@ -47,7 +47,7 @@ static constexpr SQLSMALLINT qParamType[4] = { SQL_PARAM_INPUT, SQL_PARAM_INPUT,
 class SqlStmtHandle
 {
 public:
-    SqlStmtHandle(SQLHANDLE hDbc = SQL_NULL_HSTMT)
+    SqlStmtHandle(SQLHANDLE hDbc)
     {
         SQLAllocHandle(SQL_HANDLE_STMT, hDbc, &stmtHandle);
     }