Fix syntax error in debian/control

debian/control does not allow creating dependency lists by repeating
Depends: field, like RPM .spec files do.  I did not realize it when
adding coerce.sh

packaging/debian/control

@@ -174,9 +174,10 @@ Description: Shellfu/sh module for building interactive terminal menus
 
 Package: shellfu-sh-coerce
 Architecture: all
-Depends: shellfu-sh
-Depends: perl
-Depends: perl-modules
+Depends:
+ shellfu-sh,
+ perl,
+ perl-modules,
 Description: Shellfu/sh module with data coercion helpers
  Shellfu is an attempt to add modularity to your shell scripts.
  .