JAX-RS Explorer: Fix generation of URI for matrix's and query's default values

If there is a query or matrix parameter, the JAX-RS Explorer should generate URI by following template:

Name={Type=DefaultValue}

e.g. /rest?param={int=0}

However, in 4.2.0.Beta1 (respin-a) the generation of parameter's URI is wrong:

Name={Type:DefaultValue}

e.g. /rest?param={String:0}