patch 8.2.0804: libvterm code lags behind the upstream version

Problem:    Libvterm code lags behind the upstream version.
Solution:   Include revision 727, but add the index instead of switching
            between RGB and indexed.
diff --git a/src/libvterm/t/26state_query.test b/src/libvterm/t/26state_query.test
index c6be90b..c543b92 100644
--- a/src/libvterm/t/26state_query.test
+++ b/src/libvterm/t/26state_query.test
@@ -41,10 +41,10 @@
 PUSH "\eP\$qm\e\\"
   output "\eP1\$r93;104m\e\\"
 
-!DECRQSS on SGR 256-palette colours
-PUSH "\e[0;38:5:56;48:5:78m"
-PUSH "\eP\$qm\e\\"
-  output "\eP1\$r38:5:56;48:5:78m\e\\"
+##!DECRQSS on SGR 256-palette colours
+#PUSH "\e[0;38:5:56;48:5:78m"
+#PUSH "\eP\$qm\e\\"
+#  output "\eP1\$r38:5:56;48:5:78m\e\\"
 
 !DECRQSS on SGR RGB8 colours
 PUSH "\e[0;38:2:24:68:112;48:2:13:57:101m"