Duplicate on_activated listener

[shardulm94]

I guess it should be safe to remove the first on_activated listener.

class TrailingSpacesListener(sublime_plugin.EventListener):
    def on_modified(self, view):
        if trailing_spaces_live_matching:
            match_trailing_spaces(view)

    def on_activated(self, view):
        if trailing_spaces_live_matching:
            match_trailing_spaces(view)

    def on_selection_modified(self, view):
        if trailing_spaces_live_matching:
            match_trailing_spaces(view)

    def on_activated(self, view):
        self.freeze_last_version(view)
        if trailing_spaces_live_matching:
            match_trailing_spaces(view)

[rchl]

This is now fixed on master.