gui: Minor spacing updates

This helps some widgets line up better, instead of looking slightly out
of place.

Signed-off-by: Anna Schumaker <Anna@OcarinaProject.net>

CHANGELOG

@@ -1,5 +1,6 @@
 6.4.14:
 - Initialize track labels with the correct initial size
+- Gui spacing updates
 
 6.4.15-rc:
 - Write data files to a temporary file first, then rename

share/ocarina/ocarina6.glade

@@ -813,6 +813,7 @@
           <object class="GtkPaned" id="o_sidebar">
             <property name="visible">True</property>
             <property name="can_focus">True</property>
+            <property name="vexpand">True</property>
             <property name="position">125</property>
             <property name="position_set">True</property>
             <signal name="notify::position" handler="__sidebar_resize" swapped="no"/>
@@ -1380,6 +1381,7 @@
                   <object class="GtkBox" id="box3">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
+                    <property name="margin_top">2</property>
                     <property name="homogeneous">True</property>
                     <child>
                       <object class="GtkProgressBar" id="o_idle_progress">
@@ -1464,6 +1466,13 @@
       <widget name="o_enable"/>
     </widgets>
   </object>
+  <object class="GtkSizeGroup">
+    <property name="mode">vertical</property>
+    <widgets>
+      <widget name="buttonbox2"/>
+      <widget name="box10"/>
+    </widgets>
+  </object>
   <object class="GtkSizeGroup" id="sizegroup1">
     <property name="ignore_hidden">True</property>
     <widgets>