Revert "Revert "Added Tango colors to palette""

These are default line and fill colors, so it's better to duplicate these in the
standard palette to show the color names in the toolbar conrols.

This reverts commit de7b2781.

Change-Id: I8a39c28b464980598a58ac559905aab86aac3e26

extras/source/palettes/standard.soc

@@ -195,4 +195,6 @@
   <draw:color draw:name="Chart 10" draw:color="#ff950e"/>
   <draw:color draw:name="Chart 11" draw:color="#c5000b"/>
   <draw:color draw:name="Chart 12" draw:color="#0084d1"/>
+  <draw:color draw:name="Tango: Sky Blue 1" draw:color="#729fcf" />
+  <draw:color draw:name="Tango: Sky Blue 2" draw:color="#3465a4" />
 </office:color-table>