'Prototype-Tests-Core' should also require 'Seaside-Test-Cavas'

[marianopeck]

In #baselinescriptaculous: we can see this:

package: 'Prototype-Tests-Core' with: [
				spec requires: #('Prototype-Core' 'Javascript-Tests-Core' 'Seaside-Tests-Functional') ];

However, Prototype-Tests-Core has subclass of WAScriptGeneratorTest. WAScriptGeneratorTest belongs to Seaside-Test-Cavas and this package is not included in the above #requires.

Proposed change:

package: 'Prototype-Tests-Core' with: [
				spec requires: #('Prototype-Core' 'Javascript-Tests-Core' 'Seaside-Tests-Functional' 'Seaside-Test-Cavas' ) ];