Fixed KeyError when loading Windows targets over SMB

[Paradoxis]

Change various ["sysvol"] statements to .get methods as to avoid breaking SMB targets with low-privileged credentials

│                                                                                                  │
│ /home/user/.local/lib/python3.11/site-packages/dissect/target/plugins/os/windows/_os.py:82 in    │
│ add_mounts                                                                                       │
│                                                                                                  │
│    79 │   │   │   self.target.log.debug("", exc_info=e)                                          │
│    80 │   │                                                                                      │
│    81 │   │   # Fallback mount the sysvol to C: if we didn't manage to mount it to any other d   │
│ ❱  82 │   │   if operator.countOf(self.target.fs.mounts.values(), self.target.fs.mounts["sysvo   │
│    83 │   │   │   if "c:" not in self.target.fs.mounts:                                          │
│    84 │   │   │   │   self.target.log.debug("Unable to determine drive letter of sysvol, falli   │
│    85 │   │   │   │   self.target.fs.mount("c:", self.target.fs.mounts["sysvol"])                │
│                                                                                                  │
│ ╭─────────────────────────────────────── locals ────────────────────────────────────────╮        │
│ │ self = <dissect.target.plugins.os.windows._os.WindowsPlugin object at 0x7f87c488a3d0> │        │
│ ╰───────────────────────────────────────────────────────────────────────────────────────╯        │
╰──────────────────────────────────────────────────────────────────────────────────────────────────╯
KeyError: 'sysvol'

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.01%. Comparing base (b89b12d) to head (51defd2).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #726   +/-   ##
=======================================
  Coverage   75.01%   75.01%           
=======================================
  Files         294      294           
  Lines       25016    25018    +2     
=======================================
+ Hits        18766    18768    +2     
  Misses       6250     6250           

Flag	Coverage Δ
unittests	75.01% <100.00%> (+<0.01%)	⬆️

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[Miauwkeru]

I was asked to make it a bit more explicit with the changes