Fix syntax error that broke fish support (#36)

Author: haslersn

bin/any-nix-shell

@@ -44,7 +44,8 @@ end
 
 # Overwrite the nix command
 function nix
-    if test \$argv[1] = run or test \$argv[1] = develop
+    if test \$argv[1] = run
+    or test \$argv[1] = develop
         $(which .any-nix-wrapper) fish \$argv
     else
         command nix \$argv