Fix: Log Filter (fsacSilencedLogs) doesn't work when multiple categories specified

[Booksbaum]

Reason: Categories are combined into comma-separated list of categories, which is emitted as single string:

• Setting:

  "FSharp.fsac.silencedLogs": [
    "FileSystem",
    "Compiler",
  ]

• passed into FsAutoComplete:

  --filter "FileSystem,Compiler"
  

-> interpreted in FsAutoComplete as single category "FileSystem,Compiler" instead of two categories.

Correct filter for FsAutoComplete:

--filter FileSystem Compiler

(List with categories separated by space)

[baronfel]

Good fix, thanks!