[geary] Ensure composer overlay widget isn't visible by default.

[Michael Gratton <mjog src gnome org>]

commit adf168218ec6167dfed1e8bb85f1fff94d93143d
Author: Michael James Gratton <mike vee net>
Date:   Mon Apr 16 11:46:00 2018 +1000

    Ensure composer overlay widget isn't visible by default.
    
    Followup for commit 07b4a784.

 ui/composer-widget.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/ui/composer-widget.ui b/ui/composer-widget.ui
index 56d01d6..d2fdf5d 100644
--- a/ui/composer-widget.ui
+++ b/ui/composer-widget.ui
@@ -811,8 +811,8 @@
                     </child>
                     <child type="overlay">
                       <object class="GtkLabel" id="message_overlay_label">
-                        <property name="visible">True</property>
                         <property name="can_focus">False</property>
+                        <property name="no_show_all">True</property>
                         <property name="halign">start</property>
                         <property name="valign">end</property>
                         <property name="ellipsize">middle</property>