Fix the wrong job filter with job search API

Created by: LinuxSuRen

What type of PR is this? /kind bug /area devops

What this PR does / why we need it:

Which issue(s) this PR fixes: None.

Special notes for reviewers:

The error log output from Jenkins:

2020-12-28 06:16:36.495+0000 [id=14]    WARNING h.i.i.InstallUncaughtExceptionHandler#handleException: Caught unhandled exception with ID bd273797-7a0f-44a4-a88f-25113a0f4809
java.lang.IllegalArgumentException: Invalid filter type specified.
        at io.jenkins.blueocean.service.embedded.rest.ContainerFilter.getFilters(ContainerFilter.java:95)
        at io.jenkins.blueocean.service.embedded.rest.ContainerFilter.filter(ContainerFilter.java:46)
        at io.jenkins.blueocean.service.embedded.rest.ContainerFilter.filter(ContainerFilter.java:39)
        at io.jenkins.blueocean.service.embedded.rest.PipelineSearch.search(PipelineSearch.java:100)
        at io.jenkins.blueocean.rest.ApiHead.search(ApiHead.java:61)
        at java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)
        at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:396)
        at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:408)
        at org.kohsuke.stapler.ForwardingFunction.invoke(ForwardingFunction.java:83)
        at io.jenkins.blueocean.rest.pageable.PagedResponse$Processor.invoke(PagedResponse.java:42)
        at org.kohsuke.stapler.PreInvokeInterceptedFunction.invoke(PreInvokeInterceptedFunction.java:26)
        at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:212)
        at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:145)
        at org.kohsuke.stapler.MetaClass$11.doDispatch(MetaClass.java:536)
        at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:766)
Caused: javax.servlet.ServletException
        at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:816)

The screenshot after using the correct parameter:

Additional documentation, usage docs, etc.: The possible value contains: no-folders, origin, pull-request