snap-confine: update apparmor rules for fedora based base snaps

[mvo5]

On fedora /bin,/lib,/sbin are just symlinks to /usr/{bin,lib,sbin} so we need to update our apparmor rules for fedora based base snaps.

[jdstrand]

Personally I prefer {,/usr} over {/usr,}, but no need to change if you aren't making other changes. Approved.

[zyga]

+1

[Conan-Kudo]

@mvo5 @jdstrand already approved this PR. And it looks good to merge to me as well.

[codecov-io]

Codecov Report

Merging #3979 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3979   +/-   ##
=======================================
  Coverage   75.97%   75.97%           
=======================================
  Files         423      423           
  Lines       36505    36505           
=======================================
  Hits        27734    27734           
  Misses       6833     6833           
  Partials     1938     1938

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