x11/xterm: update to 383

Patch #383 - 2023/06/27
 - expand description of full- and soft-reset in the manual.
 - fixes for full- and soft-reset:
    - clear alternate screen on full reset.
    - disable menu-entry for active icon; it merely shows whether the feature
      is enabled.
    - use appcursorDefault and appkeypadDefault resources for reset of DECCKM
      and DECKPM.
    - save initial resource values for sixelScrolling and privateColorRegisters,
      using those in full reset.
    - update checkbox for Enable Blinking Cursor (report by Rajeev V. Pillai).
 - add reply for DECSACE with DECRQSS.
 - modify status-line feature to exit without erasing for DECSTR.
 - add private mode 1045 which imitates the original xterm cursor-back reverse
   wrapping mode 45 (see patch #380).
 - improve checks for non-Unicode values, e.g., in DECRQCRA.
 - re-checkout from RCS archive to fix stale identifiers (report by Sven
   Joachim).


(pin)