build: add an install rule in rdbgui4sasa.opam

rdbgui4sasa.opam

@@ -19,7 +19,8 @@ depends: [
   "dune" {>= "2.8.5"}
   "lutils" {>= "0"}
 ]
-build: ["dune" "build" "@install"]
+build: ["dune" "build"]
+install: ["dune" "install"]
 post-messages:
   "The last version can be obtained via (opam repo add) http://www-verimag.imag.fr/DIST-TOOLS/SYNCHRONE/opam-repository/"
 depexts: ["graphviz" "emacs" "gnuplot" "zathura"]