NFMDemodGui: Add spacer between CTCSS and volume controls to make it look nice when stretched

plugins/channelrx/demodnfm/nfmdemodgui.ui

@@ -583,6 +583,19 @@
         </property>
        </widget>
       </item>
+      <item>
+       <spacer name="horizontalSpacer_2">
+        <property name="orientation">
+         <enum>Qt::Horizontal</enum>
+        </property>
+        <property name="sizeHint" stdset="0">
+         <size>
+          <width>40</width>
+          <height>20</height>
+         </size>
+        </property>
+       </spacer>
+      </item>
       <item>
        <widget class="QLabel" name="volumeLabel">
         <property name="text">