examples/apigateway: fix bug in addsvc PathPrefix
examples/apigateway: fix bug in addsvc PathPrefix

martinbaillie/kit,anarcher/kit,basvanbeek/kit,martinbaillie/kit,go-kit/kit,nicot/kit,xmattstrongx/kit,xmattstrongx/kit,basvanbeek/kit,anarcher/kit,go-kit/kit,nicot/kit