Fix '$scope.filteredLogs is undefined'

When loading the "Event log" page '$scope.filteredLogs is undefined'
is logged in the console.

https://github.com/openbmc/phosphor-webui/commit/1ca1d7e10ed0ef47206bb89f6dcc5778b1239519
moved the watch on the all logs checkbox to $scope.filteredLogs.

Add $scope.filteredLogs to the top of the file so it is not
undefined on page load.

Tested: No longer see the console message.
Change-Id: Ifa49b416db1a692fc16b3325cef26f59189855a8
Signed-off-by: Gunnar Mills <gmills@us.ibm.com>
diff --git a/app/server-health/controllers/log-controller.js b/app/server-health/controllers/log-controller.js
index 88fac77..5e6db6d 100644
--- a/app/server-health/controllers/log-controller.js
+++ b/app/server-health/controllers/log-controller.js
@@ -24,6 +24,7 @@
             $filter) {
           $scope.dataService = dataService;
           $scope.logs = [];
+          $scope.filteredLogs = [];
           $scope.tmz = 'EDT';
           $scope.itemsPerPage = Constants.PAGINATION.LOG_ITEMS_PER_PAGE;
           $scope.loading = false;