Add threshold to check if admin log viewer is at bottom

packages/rocketchat-logger/client/views/viewLogs.coffee

@@ -32,8 +32,9 @@ Template.viewLogs.onRendered ->
 
 	template = this
 
-	template.isAtBottom = ->
-		if wrapper.scrollTop >= wrapper.scrollHeight - wrapper.clientHeight
+	template.isAtBottom = (scrollThreshold) ->
+		if not scrollThreshold? then scrollThreshold = 0
+		if wrapper.scrollTop + scrollThreshold >= wrapper.scrollHeight - wrapper.clientHeight
 			newLogs.className = "new-logs not"
 			return true
 		return false
@@ -43,7 +44,7 @@ Template.viewLogs.onRendered ->
 		newLogs.className = "new-logs not"
 
 	template.checkIfScrollIsAtBottom = ->
-		template.atBottom = template.isAtBottom()
+		template.atBottom = template.isAtBottom(100)
 		readMessage.enable()
 		readMessage.read()