Remove useless code from the about & export dialogs.

A follow-up to PR #3826.

Author: Hussam Eddin Alhomsi

src/gui/dialogs/about_dialog.ui

@@ -20,23 +20,6 @@
    <string>About LMMS</string>
   </property>
   <layout class="QVBoxLayout" name="verticalLayout_3">
-<!--
-   <property name="spacing">
-    <number>8</number>
-   </property>
-   <property name="leftMargin">
-    <number>8</number>
-   </property>
-   <property name="topMargin">
-    <number>8</number>
-   </property>
-   <property name="rightMargin">
-    <number>8</number>
-   </property>
-   <property name="bottomMargin">
-    <number>8</number>
-   </property>
--->
    <item>
     <layout class="QHBoxLayout" name="horizontalLayout">
      <item>
@@ -47,8 +30,6 @@
          <height>64</height>
         </size>
        </property>
-       <property name="text">
-       </property>
       </widget>
      </item>
      <item>
@@ -278,36 +259,12 @@ If you're interested in translating LMMS in another language or want to improve
    <signal>accepted()</signal>
    <receiver>AboutDialog</receiver>
    <slot>accept()</slot>
-<!--
-   <hints>
-    <hint type="sourcelabel">
-     <x>248</x>
-     <y>254</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>157</x>
-     <y>274</y>
-    </hint>
-   </hints>
--->
   </connection>
   <connection>
    <sender>buttonBox</sender>
    <signal>rejected()</signal>
    <receiver>AboutDialog</receiver>
    <slot>reject()</slot>
-<!--
-   <hints>
-    <hint type="sourcelabel">
-     <x>316</x>
-     <y>260</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>286</x>
-     <y>274</y>
-    </hint>
-   </hints>
--->
   </connection>
  </connections>
 </ui>

src/gui/dialogs/export_project.ui

@@ -48,14 +48,6 @@
         <string>File format settings</string>
        </property>
        <layout class="QVBoxLayout">
-<!--
-        <property name="spacing">
-         <number>6</number>
-        </property>
-        <property name="leftMargin">
-         <number>9</number>
-        </property>
--->
         <item>
          <widget class="QLabel" name="label">
           <property name="text">
@@ -122,14 +114,6 @@
         </item>
         <item>
          <widget class="QWidget" name="depthWidget" native="true">
-<!--
-          <property name="minimumSize">
-           <size>
-            <width>0</width>
-            <height>20</height>
-           </size>
-          </property>
--->
           <layout class="QVBoxLayout">
            <property name="leftMargin">
             <number>0</number>
@@ -249,11 +233,6 @@
              <property name="currentIndex">
               <number>-1</number>
              </property>
-<!--
-             <property name="maxVisibleItems">
-              <number>9</number>
-             </property>
--->
             </widget>
            </item>
           </layout>
@@ -262,11 +241,6 @@
         <item>
          <widget class="QWidget" name="bitrateWidget" native="true">
           <layout class="QVBoxLayout">
-<!--
-           <property name="spacing">
-            <number>6</number>
-           </property>
--->
            <property name="leftMargin">
             <number>0</number>
            </property>