Bug 1391647 - Fix header title in about:telemetry r=chutten

Clicking on a subsection then clicking on a section now change the
title.

MozReview-Commit-ID: AmdO0DTRstr

--HG--
extra : rebase_source : f0d2b53643add4612de9233142e9144d583f70c6

toolkit/content/aboutTelemetry.js

@@ -1897,6 +1897,8 @@ function show(selected) {
     }
   }
 
+  adjustHeaderState();
+
   let current_button = document.querySelector(".category.selected");
   if (current_button == selected)
     return;
@@ -1911,7 +1913,6 @@ function show(selected) {
   // Hack because subsection text appear selected. See Bug 1375114.
   document.getSelection().empty();
 
-  adjustHeaderState();
   displayProcessesSelector(selectedValue);
   adjustSearchState();
   changeUrlPath(selectedValue);