Removed one forgotten modifierFlags setter.
Removed one forgotten modifierFlags setter.

It’s not needed now the class is effectively immutable.

shpakovski/MASShortcut,ianyh/MASShortcut,MacPaw/MASShortcut,mpapp/MASShortcut,shpakovski/MASShortcut,MacPaw/MASShortcut,baz/MASShortcut,shpakovski/MASShortcut