Fix console log scroll pinning

There appears to be no id="header" element in these pages. In old JQuery this returned null, and was treated as 0, however it returns undefined in
modern JQuery which makes the calculation evaluation to NaN, breaking the functionality.

Author: chadlwilson

server/src/main/webapp/WEB-INF/rails/app/assets/javascripts/build_detail_page.js

@@ -150,7 +150,7 @@
       $(".content_wrapper_outer").toggleClass("full-screen");
       $(window).trigger($.Event("resetPinOnScroll"), [{
         calcRequiredScroll: function () {
-          return $(".console-area").offset().top - $("#header").outerHeight(true) - $(".page_header").outerHeight(true);
+          return $(".console-area").offset().top - $(".page_header").outerHeight(true);
         }
       }]);
     });

server/src/main/webapp/WEB-INF/rails/app/assets/javascripts/console_log_tailing.js

@@ -81,7 +81,7 @@
     $(".console-area").on('consoleCompleted consoleUpdated consoleInteraction', function () {
       $(window).trigger($.Event("resetPinOnScroll"), [{
         calcRequiredScroll: function () {
-          return $(".console-area").offset().top - $("#header").outerHeight(true) - $(".page_header").outerHeight(true);
+          return $(".console-area").offset().top - $(".page_header").outerHeight(true);
         }
       }]);
     });