[FIX] web_editor: do not open text toolbar on change icon color

If you clicked on a pictogram, then changed its color with the text
colorpicker in the toolbar, the toolbar was replaced with the regular
text toolbar, even though what was being edited was the pictogram.
That's because the information of the last media clicked was lost in the
process.

task-3045166

Part-of: odoo/odoo#106788