fix issue #77 - font size of mainwindow

src/mainwindow.ui

@@ -22,7 +22,7 @@
     <item>
      <widget class="QTabWidget" name="tabWidget">
       <property name="currentIndex">
-       <number>4</number>
+       <number>0</number>
       </property>
       <widget class="QWidget" name="tab">
        <attribute name="title">
@@ -85,12 +85,6 @@
                      <verstretch>0</verstretch>
                     </sizepolicy>
                    </property>
-                   <property name="font">
-                    <font>
-                     <pointsize>11</pointsize>
-                     <kerning>true</kerning>
-                    </font>
-                   </property>
                    <property name="text">
                     <string>Notarized</string>
                    </property>