[CDEC-383] Revert to 80 column width (input-output-hk#3149)

Author: ruhatch

.editorconfig

@@ -14,4 +14,4 @@ indent_size = 8
 
 [*.hs]
 indent_size = 4
-max_line_length = 100
+max_line_length = 80

.hindent.yaml

@@ -1,3 +1,3 @@
 indent-size: 4
-line-length: 100
+line-length: 80
 force-trailing-newline: true