Extend shapes plugin width to include the ellipsoid button (gazebosim#2699)

Signed-off-by: Ian Chen <ichen@openrobotics.org>

Author: iche033

src/gui/gui.config

@@ -171,7 +171,7 @@
     <property key="resizable" type="bool">false</property>
     <property key="x" type="double">0</property>
     <property key="y" type="double">0</property>
-    <property key="width" type="double">250</property>
+    <property key="width" type="double">300</property>
     <property key="height" type="double">50</property>
     <property key="state" type="string">floating</property>
     <property key="showTitleBar" type="bool">false</property>
@@ -183,7 +183,7 @@
 <plugin filename="Lights" name="Lights">
   <gz-gui>
     <property key="resizable" type="bool">false</property>
-    <property key="x" type="double">250</property>
+    <property key="x" type="double">300</property>
     <property key="y" type="double">0</property>
     <property key="width" type="double">150</property>
     <property key="height" type="double">50</property>