Fix fret ruler extension parsing scales

extensions/fablabchemnitz/fret_ruler/scales/cet83a.scl

@@ -0,0 +1,53 @@
+! cet83a.scl
+!
+48th root of 10
+ 48
+!
+ 83.04820
+ 166.09640
+ 249.14461
+ 332.19281
+ 415.24101
+ 498.28921
+ 581.33742
+ 664.38562
+ 747.43382
+ 830.48202
+ 913.53023
+ 996.57843
+ 1079.62663
+ 1162.67483
+ 1245.72304
+ 1328.77124
+ 1411.81944
+ 1494.86764
+ 1577.91585
+ 1660.96405
+ 1744.01225
+ 1827.06045
+ 1910.10865
+ 1993.15686
+ 2076.20506
+ 2159.25326
+ 2242.30146
+ 2325.34967
+ 2408.39787
+ 2491.44607
+ 2574.49427
+ 2657.54248
+ 2740.59068
+ 2823.63888
+ 2906.68708
+ 2989.73529
+ 3072.78349
+ 3155.83169
+ 3238.87989
+ 3321.92809
+ 3404.97630
+ 3488.02450
+ 3571.07270
+ 3654.12090
+ 3737.16911
+ 3820.21731
+ 3903.26551
+ 10/1