UI: Increase maximum size of settings' sidebar

Some languages such as Spanish or Brazilian Portuguese have longer
words that make the sidebar scroll. Unfortunately Qt reports a rather
large minimum size for the sidebar, so simply removing the maximum
size is not an option.

Increase maximum width of the sidebar to 180px.

UI/forms/OBSBasicSettings.ui

@@ -38,7 +38,7 @@
        </property>
        <property name="maximumSize">
         <size>
-         <width>135</width>
+         <width>180</width>
          <height>16777215</height>
         </size>
        </property>