The NSIS installer deleted HKLM/HKCU CurrentVersion\Run values it never
writes, which matches common AV heuristics for unwanted Run-key
manipulation and is suspected to contribute to Windows Defender and
third-party antivirus false positives on the installer.
Drop all autostart registry deletions from both the install and
uninstall sections so the installer only touches keys it creates
itself. Cleanup of the legacy machine-wide entry written by old
installers is left to documentation.
Extends the approach of the closed PR #6735, which only removed the
per-user deletion on uninstall.
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