Fix formatting in internal stats for vp10

This corrects a formatting error introduced in:
I1e9d548ce445d29002f0c59ebfd3957a6f15e702
where spaces were used as delimiters instead of tabs.

The corresponding fixes for vp9 and vp8 are in
Ibc4eb8fd82e6b926ba259a679dc98557cadba9b1.

Change-Id: Ica3d625d6672b3c47e0e208b45eede29b9004030

av1/encoder/encoder.c

@@ -2526,9 +2526,8 @@ void av1_remove_compressor(AV1_COMP *cpi) {
           SNPRINT2(results, "\t%7.3f", consistency);
           SNPRINT2(results, "\t%7.3f", cpi->worst_consistency);
         }
-
-        fprintf(f, "%s\t    Time  Rc-Err Abs Err\n", headings);
-        fprintf(f, "%s\t%8.0f %7.2f %7.2f\n", results, total_encode_time,
+        fprintf(f, "%s\t    Time\tRcErr\tAbsErr\n", headings);
+        fprintf(f, "%s\t%8.0f\t%7.2f\t%7.2f\n", results, total_encode_time,
                 rate_err, fabs(rate_err));
       }