Fix initial setting in logs - it should be set to null after 1st line

assets/scripts/lib/travis/log.coffee

@@ -69,9 +69,10 @@ FOLDS = [
         else if @get 'newline'
           @set 'newline', false
         else if !@initial
-          @initial = false
           payload.append = true
 
+        @initial = false
+
         if payload.foldContinuation && payload.content.match(/Done. Build script exited with:/)
           # script ended, but fold is still closed, which most probably means
           # error, end the fold and open it.