Fixed owners header font family too

src/devtools/views/Components/SelectedElement.css

@@ -27,6 +27,10 @@
   border-top: 1px solid var(--color-border);
 }
 
+.OwnersHeader {
+  font-family: var(--font-family-sans);
+}
+
 .Component,
 .Owner {
   overflow: hidden;

src/devtools/views/Components/SelectedElement.js

@@ -184,7 +184,7 @@ function InspectedElementView({
 
       {ownerStack.length === 0 && owners !== null && owners.length > 0 && (
         <div className={styles.Owners}>
-          <div>owner stack</div>
+          <div className={styles.OwnersHeader}>owner stack</div>
           {owners.map(owner => (
             <OwnerView
               key={owner.id}