UI: Undo/fix stats dock changes to main window

The stats dock was incorrectly added to the .ui file, causing the stats
dock to show by default on startup, and just generally causing a bad
default startup UI appearance.  This fixes that by adding the stats dock
programmatically/dynamically instead of modifying the .ui file.

UI/forms/OBSBasic.ui

@@ -7,7 +7,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>1238</width>
+    <width>1079</width>
     <height>730</height>
    </rect>
   </property>
@@ -105,8 +105,8 @@
     <rect>
      <x>0</x>
      <y>0</y>
-     <width>1238</width>
-     <height>22</height>
+     <width>1079</width>
+     <height>21</height>
     </rect>
    </property>
    <widget class="QMenu" name="menu_File">
@@ -644,7 +644,7 @@
           <rect>
            <x>0</x>
            <y>0</y>
-           <width>78</width>
+           <width>230</width>
            <height>16</height>
           </rect>
          </property>
@@ -698,7 +698,7 @@
            <x>0</x>
            <y>0</y>
            <width>16</width>
-           <height>28</height>
+           <height>230</height>
           </rect>
          </property>
          <property name="sizePolicy">
@@ -1101,21 +1101,6 @@
     </layout>
    </widget>
   </widget>
-  <widget class="QDockWidget" name="statsDock">
-   <property name="minimumSize">
-    <size>
-     <width>168</width>
-     <height>103</height>
-    </size>
-   </property>
-   <property name="windowTitle">
-    <string>Basic.Stats</string>
-   </property>
-   <attribute name="dockWidgetArea">
-    <number>2</number>
-   </attribute>
-   <widget class="QWidget" name="dockWidgetContents"/>
-  </widget>
   <action name="actionAddScene">
    <property name="icon">
     <iconset resource="obs.qrc">