Remove irrelevant styles

Bug: Issue 10029
Change-Id: I297f84a73ed23aebeb4d91412c68d9f67966a1af
diff --git a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.html b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.html
index 5fa8187..6ce1a09 100644
--- a/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.html
+++ b/polygerrit-ui/app/elements/admin/gr-repo/gr-repo.html
@@ -56,7 +56,6 @@
     <style include="gr-form-styles"></style>
     <main class="gr-form-styles read-only">
       <style include="shared-styles"></style>
-      <style include="dashboard-header-styles"></style>
       <div class="info">
         <h1 id="Title" class$="name">
           [[repo]]