[gnome-maps/gnome-42] transitOptionsPanel: Fix one-off error when setting date

[Marcus Lundblad <mlundblad src gnome org>]

commit 5a53cf49dd73e83f839df8d370729df6b635cbb1
Author: Marcus Lundblad <ml dfupdate se>
Date:   Mon May 2 22:13:11 2022 +0200

    transitOptionsPanel: Fix one-off error when setting date
    
    When setting the GtkCalendar date when clicking the date
    button when using "Leave By" or "Arrive By" we need to
    subtact one to the month value, as the select_month()
    method expects 0-based months.

 src/transitOptionsPanel.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/transitOptionsPanel.js b/src/transitOptionsPanel.js
index cdadc84c..70e1a57e 100644
--- a/src/transitOptionsPanel.js
+++ b/src/transitOptionsPanel.js
@@ -138,7 +138,7 @@ var TransitOptionsPanel = GObject.registerClass({
     _updateTransitDateButton(date) {
         let calendar = this._transitDateButton.popover.get_child();
 
-        calendar.select_month(date.get_month(), date.get_year());
+        calendar.select_month(date.get_month() - 1, date.get_year());
         calendar.select_day(date.get_day_of_month());
         this._transitDateButton.label =
             /*