syncthing.xcodeproj/project.pbxproj: Rename PRODUCT_BUNDLE_IDENTIFIER for Sparkle updater (see #74) (#79)
syncthing.xcodeproj/project.pbxproj: Rename PRODUCT_BUNDLE_IDENTIFIER for Sparkle updater (see #74) (#79)

From com.github.syncthing.syncthing-macos back to com.github.xor-gate.syncthing-macosx to fix Sparkle update issue in #74.
xor-gate/syncthing-macosx,xor-gate/syncthing-macosx,xor-gate/syncthing-macosx