display: force the cursor to reappear in a better way (when using Slang)

The cursor would disappear after any message on the status bar --
for example, also when M-W is typed and nothing is found -- so the
mitigation trick needs to be performed in statusline() itself.

This addresses https://savannah.gnu.org/bugs/?59091.

src/files.c

@@ -2293,10 +2293,6 @@ void do_savefile(void)
 {
 	if (do_writeout(FALSE, FALSE) == 2)
 		close_and_go();
-#ifdef USE_SLANG
-	/* Work around a shy cursor -- https://sv.gnu.org/bugs/?59091. */
-	bottombars(MREPLACEWITH);
-#endif
 }
 
 /* Convert the tilde notation when the given path begins with ~/ or ~user/.

src/nano.c

@@ -1303,10 +1303,6 @@ void unbound_key(int code)
 	else
 		statusline(ALERT, _("Unbound key: %c"), code);
 #endif
-#ifdef USE_SLANG
-	/* Work around a shy cursor -- https://sv.gnu.org/bugs/?59091. */
-	bottombars(MREPLACEWITH);
-#endif
 }
 
 #ifdef ENABLE_MOUSE

src/winio.c

@@ -2127,6 +2127,11 @@ void statusline(message_type importance, const char *msg, ...)
 		statusblank = 1;
 	else
 		statusblank = 26;
+
+#ifdef USE_SLANG
+	/* Work around a shy cursor -- https://sv.gnu.org/bugs/?59091. */
+	bottombars(MGOTODIR);
+#endif
 }
 
 /* Display a normal message on the status bar, quietly. */
@@ -3307,8 +3312,7 @@ void report_cursor_position(void)
 			column, fullwidth, colpct, sum, openfile->totsize, charpct);
 
 #ifdef USE_SLANG
-	/* Work around a shy cursor -- https://sv.gnu.org/bugs/?59091. */
-	bottombars(MREPLACEWITH);
+	/* Restore the help lines after the above call overwrote them. */
 	bottombars(MMAIN);
 #endif
 }