Show deleted issues in the webui

Revert commit ff4e4de.

The issue described in #141 was caused by using a wrong old (also known
as old) project in the API endpoint. This issue was fixed in the meantime.

src/api/app/mixins/parse_package_diff.rb

@@ -3,7 +3,6 @@ def issues_hash(sourcediff)
     ret = {}
     sourcediff.get('issues').elements('issue') do |issue|
       next unless issue['name']
-      next if issue['state'] == 'deleted'
 
       i = Issue.find_by_name_and_tracker(issue['name'], issue['tracker'], nonfatal: 1)
       ret[issue['label']] = i.webui_infos if i

src/api/spec/mixins/parse_package_diff_spec.rb

@@ -119,7 +119,7 @@
       it { expect(subject[issue.label][:tracker]).to eq(issue_tracker.name) }
 
       it { expect(subject[:empty]).to be_nil }
-      it { expect(subject[deleted_issue.label]).to be_nil }
+      it { expect(subject[deleted_issue.label][:name]).to eq(deleted_issue.name) }
     end
   end
 end