Remove two-char short args.

In UNIX, this would mean the shorthand notation for `-w -t`, which is
confusing and conflicts with the existing `-w` and `-t` flags.  Instead,
if you need this, you'll have to spell the flag name out because we've
run out of chars that make sense.

rq/scripts/rqworker.py

@@ -23,8 +23,8 @@ def parse_args():
     parser.add_argument('--name', '-n', default=None, help='Specify a different name')
     parser.add_argument('--worker-class', '-w', action='store', default='rq.Worker', help='RQ Worker class to use')
     parser.add_argument('--path', '-P', default='.', help='Specify the import path.')
-    parser.add_argument('--results-ttl', '-rt', default=None, help='Default results timeout to be used')
-    parser.add_argument('--worker-ttl', '-wt', default=None, help='Default worker timeout to be used')
+    parser.add_argument('--results-ttl', default=None, help='Default results timeout to be used')
+    parser.add_argument('--worker-ttl', default=None, help='Default worker timeout to be used')
     parser.add_argument('--verbose', '-v', action='store_true', default=False, help='Show more output')
     parser.add_argument('--quiet', '-q', action='store_true', default=False, help='Show less output')
     parser.add_argument('--sentry-dsn', action='store', default=None, metavar='URL', help='Report exceptions to this Sentry DSN')