scp80: keep the card preset selected after a send (v2.1.18)

cardsSave() calls cardsRebuildSelect(), and the innerHTML rebuild reset the
dropdown to its first option ("- Select card -"). Since the counter sync
saves after every send, the selection was lost each time and had to be
re-picked manually. The rebuild now restores the previous selection
(guarded by the preset still existing). Service worker v155.

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "pysim-otaman-server"
-version = "2.1.17"
+version = "2.1.18"
 description = "HTTP REST server wrapping pysim for the OTAMan PWA"
 requires-python = ">=3.8"
 # pysim is a git-only dependency installed explicitly by setup.bat/setup.sh.