[Filesystem] fixed exception message when not a able to write to a directory
merged branch deeky666/fix-filesystem-exception-message (PR #8587)

This PR was squashed before being merged into the master branch (closes #8587).

Discussion
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[Filesystem] fixed exception message when not a able to write to a directory

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

This simply fixes an exception message in the Filesystem Component when a directory is not writable while dumping a file via `dumpFile()`.

Commits
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8b32a4b [Filesystem] fixed exception message when not a able to write to a directory