chart2: Fix using the last shape

Clicking a shape button works only for the default shape,
not for the last used one.

Steps to reproduce:
1) Click on the drop-down arrow of one of the shape buttons,
   and select a shape. Notice that the button icon updates
   with the last selected shape.
2) Click on another button.
3) Click on the first button, and try to draw something.
   The button doesn't work anymore. Only opening the sub
   toolbar and selecting the shape there will work.

The problem is in ToolboxController::execute that requires
the command to be in the listener map, but we didn't
register sub commands (like .uno:SymbolShapes.sun).
Instead of doing that, we'll try some generic solution.
(Note that calling the corresponding method from
SvxTbxCtlCustomShapes like we do in other methods here
won't work, because ChartController::queryDispatch checks
for the "_self" target, but SfxToolBoxControl::Dispatch
doesn't provide it.)

Change-Id: I5be3dfd3ee3ca9ab9d8080929173dbe5984f61a0
reportdesign: Fix applying the last used color

The last used color is stored inside
SvxColorToolBoxControl, so we must call its Select method
to do that. (This also fixes using the last shape, See
commit ce842113ae728e8995c7c5398204a20d0707e843 for a
fix of exactly the same problem in chart2.)

For the font color, there was also another problem:
The SID used for that button is SID_ATTR_CHAR_COLOR2.
The problem is that SvxColorToolBoxControl::Select
actually calls for that SID the ".uno:CharColorExt"
command instead of ".uno:FontColor" (which activates
in writer the format paintbrush mode). Given that since
commit 584b415924bba22db23a4258062e54973de0ed7c this
command also receives the last used color as argument,
the easiest solution is to register ".uno:CharColorExt"
here as well.

Change-Id: I2db25a7fb537ce10dfec7b1c2d049dd77d9f8f6b