make list_packages() loop

Wrap list_packages()'s main dialog widget in a while loop so the user
can return to deletion selection after reading readmes. Also correct the
text in the widget (s/uninstall/remove./).

src/usr/sbin/sbopkg

@@ -450,10 +450,11 @@ list_packages() {
         -printf "%P\n" 2> /dev/null | sort > $PKG_LIST
     if [[ -s $PKG_LIST ]]; then
         if [[ $DIAG ]]; then
+            while :; do
                 sed 's/$/ "" OFF/' $PKG_LIST > $PKG_CHECKLIST
                 dialog --separate-output --title "Installed $REPO_NAME Packages" \
                     --extra-button --extra-label "View READMEs" \
-                --checklist "Check any packages you wish to uninstall" \
+                    --checklist "Check any packages you wish to remove." \
                     20 65 13 --file $PKG_CHECKLIST 2> $REMOVE_LIST
                 case $? in
                     0)
@@ -466,14 +467,19 @@ list_packages() {
                             if [[ $? == 0 ]]; then
                                 removepkg $(cat $REMOVE_LIST)
                                 read -n1 -ep "Press any key to continue: "
+                                break
                             fi
+                        else
+                            break
                         fi
                         ;;
                     3)
                         nvabt2n $PKG_LIST $README_LIST
                         view_readmes "Installed packages:" $README_LIST
                         ;;
+                    *) break ;;
                 esac
+            done
         else
             $PAGER $PKG_LIST
         fi