[balsa/wip/gtk4] compose-window: Do not use undefined margins

[Peter Bloomfield <peterb src gnome org>]

commit c974e20dc530f0137c1d21650d0bff468237d3d2
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Wed Jul 18 20:43:07 2018 -0400

    compose-window: Do not use undefined margins

 src/compose-window.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/compose-window.c b/src/compose-window.c
index e9e3238ab..9eed120bd 100644
--- a/src/compose-window.c
+++ b/src/compose-window.c
@@ -3121,8 +3121,8 @@ create_text_area(BalsaComposeWindow *compose_window)
 #else  /* GTK_MR_236_IS_MERGED */
     gtk_text_view_set_left_margin(text_view, 0);
     gtk_text_view_set_right_margin(text_view, 0);
-    gtk_widget_set_margin_start(compose_window->text, BALSA_LEFT_MARGIN);
-    gtk_widget_set_margin_end(compose_window->text, BALSA_RIGHT_MARGIN);
+    gtk_widget_set_margin_start(compose_window->text, 2);
+    gtk_widget_set_margin_end(compose_window->text, 2);
 #endif /* GTK_MR_236_IS_MERGED */
 
     /* set the message font */