display: when back in the main loop, always redraw the help lines

(Well, redraw them when they're switched on, of course.)  Redraw
them so that they are shown correctly if their content changed.

This fixes https://savannah.gnu.org/bugs/?51356.
and fixes https://savannah.gnu.org/bugs/?51357.

src/nano.c

@@ -2605,8 +2605,7 @@ int main(int argc, char **argv)
 	}
 #endif
 
-	if (currmenu != MMAIN)
-	    display_main_list();
+	display_main_list();
 
 	lastmessage = HUSH;
 	as_an_at = TRUE;

src/text.c

@@ -2438,7 +2438,7 @@ void do_justify(bool full_justify)
 
     edit_refresh();
 
-    /* Display the shortcut list with UnJustify. */
+    /* Show "Unjustify" in the help lines. */
     uncutfunc->desc = unjust_tag;
     display_main_list();
 
@@ -2515,9 +2515,8 @@ void do_justify(bool full_justify)
 
     blank_statusbar();
 
-    /* Display the shortcut list with UnCut. */
+    /* Show "Uncut" again in the help lines. */
     uncutfunc->desc = uncut_tag;
-    display_main_list();
 }
 
 /* Justify the current paragraph. */