LibraryConfiguration.java: drop currently unnecessary imports

Author: jimklimov

src/main/java/org/jenkinsci/plugins/workflow/libs/LibraryConfiguration.java

@@ -37,12 +37,10 @@
 import hudson.model.TaskListener;
 import hudson.scm.SCM;
 import hudson.util.FormValidation;
-import jenkins.branch.Branch;
 import jenkins.model.Jenkins;
 import jenkins.scm.api.SCMFileSystem;
 import jenkins.scm.api.SCMHead;
 import jenkins.scm.api.SCMRevision;
-import jenkins.scm.api.SCMSourceOwner;
 import org.jenkinsci.plugins.workflow.cps.CpsScmFlowDefinition;
 import org.jenkinsci.plugins.workflow.flow.FlowDefinition;
 import org.jenkinsci.plugins.workflow.job.WorkflowJob;