Fix error in qdeclarativeecmascript autotest.

Fix error in qdeclarativeecmascript autotest.

The test did not correctly ignore warning messages, but instead ignored
too many messages for one data row and too few for another data row.
This error was exposed when testlib was changed in qtbase commit
d9e35e2884cc75969f0eb860082ea11f8bb95a64 to be more strict with checking
that all ignored messages are correctly produced.

Task-number: QTBUG-24156
Change-Id: Iae73fb26bda83317256c504a8cb3d45783444f66
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>