www/py-WebTest: chase PORTNAME in consumers after d35a222edd93

> py39-pecan-1.3.3 depends on package: py39-WebTest>=1.3.1 - not found

> Installing existing package /packages/All/py39-webtest-3.0.0.pkg

Installing py39-webtest-3.0.0...
[...]
Extracting py39-webtest-3.0.0: .......... done

> py39-pecan-1.3.3 depends on package: py39-WebTest>=1.3.1 - not found

• Error code 1

Reported by: pkg-fallout