Set initial size smaller

This way the dock doesn’t end up too wide

src/ui/QGCUASFileView.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>414</width>
+    <width>200</width>
     <height>518</height>
    </rect>
   </property>

src/ui/QGCUASFileViewMulti.ui

@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>400</width>
+    <width>200</width>
     <height>300</height>
    </rect>
   </property>