configure_audio: fix UI margins

src/yuzu/configuration/configure_audio.ui

@@ -58,8 +58,17 @@
       <item>
        <widget class="QWidget" name="volume_layout" native="true">
         <layout class="QHBoxLayout" name="horizontalLayout_2">
+         <property name="leftMargin">
+          <number>0</number>
+         </property>
          <property name="topMargin">
-          <number>1</number>
+          <number>0</number>
+         </property>
+         <property name="rightMargin">
+          <number>0</number>
+         </property>
+         <property name="bottomMargin">
+          <number>0</number>
          </property>
          <item>
           <widget class="QComboBox" name="volume_combo_box">