Fix syntax error in previous release

src/imapdomo.skel

@@ -46,7 +46,7 @@ mkcmd() {
     # Compose imapfilter command
     #
     echo -n "IMAPDOMO_ACTION=$Action"
-    echo -n "  LUA_PATH=$IMAPDOMO_HOME/?.lua;;"
+    echo -n "  LUA_PATH='$IMAPDOMO_HOME/?.lua;;'"
     echo -n "  IMAPDOMO_CFGDIR=$CfgDir"
     echo -n "  IMAPDOMO_HEADERS=$HeaderDir"
     echo -n "  IMAPFILTER_HOME=$CfgDir"