oeqa/selftest: Update test after fetcher error changes
The following poky commit:
4359ef08 base.bbclass: Use bb.fatal() instead of raising FuncFailed
changed the way the fetcher error is reported.
Previous reporting:
...Function failed: Fetcher failure for URL:...
New reporting:
...Fetcher failure for URL:...
Updating how the check is done fixes the test error and accurately
confirms the tested scenario for test_invalid_recipe_src_uri.
[YOCTO #10370]
Signed-off-by: Benjamin Esquivel <benjamin.esquivel@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
