Move NSIS artifactName into nsis block so it takes effect

win.artifactName is ignored by the NSIS target, so v0.5.2 still produced
"Purroxy Setup 0.5.2.exe" and latest.yml shipped with an empty sha512
and a URL that doesn't resolve on GitHub (spaces get sanitized to dots
by the release API). Moving the setting to nsis.artifactName makes
electron-builder emit Purroxy-Setup-${version}.exe on disk, matching
what the workflow's gen_yml step expects.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: mreider

electron-builder.yml

@@ -14,6 +14,7 @@ mac:
 win:
   icon: resources/icon.png
   target: nsis
+nsis:
   artifactName: ${productName}-Setup-${version}.${ext}
 linux:
   category: Utility