[ONOS-8096] In GUI2 device panel space before colon creates unnecessary wrap

Change-Id: I08ca8b70dc6c21d12714f510c9fa3473ad41c261
diff --git a/web/gui2-topo-lib/lib/panel/topopanel.base.ts b/web/gui2-topo-lib/lib/panel/topopanel.base.ts
index 40864ca..37b7a41 100644
--- a/web/gui2-topo-lib/lib/panel/topopanel.base.ts
+++ b/web/gui2-topo-lib/lib/panel/topopanel.base.ts
@@ -78,7 +78,7 @@
             tr.append('td').attr('class', cls).text(txt);
         }
 
-        addCell('label', lab + ' :');
+        addCell('label', lab);
         addCell('value', value);
     }