Remove Class-Path entry in MANIFEST.MF of vaadin-cdi

[vaadin-bot]

Originally by rmuller@xiam.nl

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The Class-Path does not make sense in the context of Vaadin usage and WildFly complains about it (which is good imho):

Class Path entry vaadin-shared-7.3.1.jar in /content/rangifer.war/WEB-INF/lib/vaadin-cdi-1.0.2.jar does not point to a valid jar for a Class-Path reference.

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Imported from https://dev.vaadin.com/ issue #15466

[hesara]

Fix will be at least in 3.0.0.alpha1, but we can also consider back-porting it to earlier branches.