Let RETURN set frequency type to current value in repeat command UI

In addition, the prompt text is shortened.

Signed-off-by: Lars Henriksen <LarsHenriksen@get2net.dk>
Signed-off-by: Lukas Fleischer <lfleischer@calcurse.org>

src/utils.c

@@ -235,6 +235,8 @@ int status_ask_choice(const char *message, const char choice[],
 				return i + 1;
 		if (ch == ESCAPE)
 			return (-1);
+		if (ch == RETURN)
+			return (-2);
 		if (resize) {
 			resize = 0;
 			wins_reset();