read-print: Be more mindful of horizontal space in packages.

Perhaps due to their staged nature, packages tend to be ‘lopsided’: deeply
nested, with the most elaborate code on the {build,right-hand-,in}side, in
snippets and phases.

When we indent outer forms too eagerly, we can easily run short on
columns by the time we get to the build code, reducing readability.  A
few strategically-placed newlines early on can make a big difference.

* guix/read-print.scm (%newline-forms): Add a newline after opening a
<package> source field or an argument list.  Compensate by removing the
base32 special case, which is now unnecessary.

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