src/appearance.ui: restore a reasonable maximum value for cornerRadius

closes #158

Author: 01micko

src/appearance.ui

@@ -108,7 +108,11 @@
      </widget>
     </item>
     <item row="3" column="1" colspan="2">
-     <widget class="QSpinBox" name="cornerRadius"/>
+     <widget class="QSpinBox" name="cornerRadius">
+      <property name="maximum">
+       <number>24</number>
+      </property>
+     </widget>
     </item>
     <item row="3" column="3" colspan="3">
      <spacer name="horizontalSpacer_6">
@@ -215,4 +219,4 @@
  </widget>
  <resources/>
  <connections/>
-</ui>
+</ui>