ParallelTest should use desired capabilities when setting up local driver

[alvarezguille]

https://github.com/vaadin/testbench/blob/master/vaadin-testbench-core/src/main/java/com/vaadin/testbench/parallel/ParallelTest.java#L154-L160

Otherwise if a Parallel test has @BrowserConfiguration with 3 browsers, three methods will be created but local chrome will be ran for all of them.