feat(Albums): Allow deleting an album photo from the viewer

[artonge]

Two issues:

1. The viewer was failing to build the Node because /files/admin was not included in the source. In the album view, the nodes' source are base on the albums DAV endpoint.
2. Even if the viewer was able to build that Node object, the delete request was only removing the photo from the album and not from the user's file system, as it was targeting the albums DAV endpoint.

Solution: give the real source to the viewer.

Then there are two other commits to:

1. React to the files:node:deleted event
2. Reset the selection on submit in the PhotosPicker

• Needs fix(Viewer): Provide id instead of fileid to File constructor viewer#2988 as the Viewer does not use the right property for the file id when building the Node object.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 2.22%. Comparing base (dfdbd3c) to head (8089f34).
⚠️ Report is 16 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3217      +/-   ##
=========================================
- Coverage    2.23%   2.22%   -0.01%     
=========================================
  Files         107     107              
  Lines        6530    6556      +26     
  Branches      121     121              
=========================================
  Hits          146     146              
- Misses       6379    6405      +26     
  Partials        5       5              

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[artonge]

/backport to stable32

[artonge]

/backport to stable31

[artonge]

/backport to stable30

[artonge]

/compile /