Stable Build 58.4.92

Getting the following Norton Antivirus firewall alert.  Don't recall seeing this typically.

Dropbox 58.4.92 Installer does not have a valid signature.

• Desktop Camera Upload was re-importing High Efficiency format photos from iOS devices that had previously been imported via the Dropbox iOS app.  This has been fixed.
• The splash screen for the first use of Desktop Camera Upload incorrectly showed "Never for This Device" on the opt-out button -- it now correctly shows "Don't Ask Again", reflecting that opting out on the first usage will prevent prompts for any other devices connected in the future.
• Minor improvements to the auto-updater
• Fix performance regression on smart sync placeholder format migration on APFS
• Other minor fixes and improvements