Fix override of custom executable

• Fixes #212: Override of syncthing Executable from .app to custom filesystem path via NSUserDefaults resets always back to bundle path

Upgrade Syncthing to v1.27.4

• Update the bundled syncthing to v1.27.4

Upgrade syncthing to v1.27.3

• Update the bundled syncthing to v1.27.3

Upgrade syncthing to v1.27.2

• Update the bundled syncthing to v1.27.2

Upgrade Syncthing to v1.27.1

• Update the bundled syncthing to v1.27.1

Upgrade syncthing to v1.27.0

• Update the bundled syncthing to v1.27.0

Upgrade Syncthing to v1.26.1

• Update the bundled syncthing to v1.26.1

Upgrade Syncthing to v1.26.0

• Update the bundled syncthing to v1.26.0

Upgrade Syncthing to v1.25.0

• Update the bundled syncthing to v1.25.0

Upgrade Syncthing to v1.24.0

• Update the bundled syncthing to v1.24.0