[shotwell] Fix stepping in slideshow settings

[Jens Georg <jensgeorg src gnome org>]

commit 5a0c773eda0982ed86ad1f266029405d5e8b375e
Author: Jens Georg <mail jensge org>
Date:   Tue Sep 11 11:24:36 2018 +0200

    Fix stepping in slideshow settings
    
    Fixes #53

 data/ui/slideshow_settings.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/ui/slideshow_settings.ui b/data/ui/slideshow_settings.ui
index fed66a3e..8bddfa85 100644
--- a/data/ui/slideshow_settings.ui
+++ b/data/ui/slideshow_settings.ui
@@ -6,7 +6,7 @@
     <property name="lower">1</property>
     <property name="upper">30</property>
     <property name="value">3</property>
-    <property name="step_increment">0.10000000000000001</property>
+    <property name="step_increment">1</property>
     <property name="page_increment">1</property>
   </object>
   <object class="GtkAdjustment" id="transition_effect_adjustment">