Timeskip do not write to file

This commit makes &tsk not write to a file.
This commit also changes tilde.py's permission to not be +x, as that's
not required for python.

plugins/tilde.py

@@ -43,10 +43,6 @@ def timeskip_plugin(msg):
         return
     if msg.arg:
         util.tilde.TIMESKIP = (msg.arg.lower() == 'true' or msg.arg.lower() == 't')
-    with open(util.tilde.TIMESKIP_FILE, "r+") as timeskipfile:
-        timeskipfile.seek(0)
-        timeskipfile.truncate()
-        timeskipfile.write(str(util.tilde.TIMESKIP))
     return pinhook.plugin.message("TIMESKIP set to '{}'".format(util.tilde.TIMESKIP))