UI: Fix position of reset filters button

This removes the horizontal spacer that pushed the filters
reset button to the right.

UI/forms/OBSBasicFilters.ui

@@ -562,19 +562,6 @@
           <property name="sizeConstraint">
            <enum>QLayout::SetMaximumSize</enum>
           </property>
-          <item>
-           <spacer name="horizontalSpacer">
-            <property name="orientation">
-             <enum>Qt::Horizontal</enum>
-            </property>
-            <property name="sizeHint" stdset="0">
-             <size>
-              <width>0</width>
-              <height>0</height>
-             </size>
-            </property>
-           </spacer>
-          </item>
           <item>
            <widget class="QDialogButtonBox" name="buttonBox">
             <property name="standardButtons">