[FIX] mis_builder: do not use color picker widget because it does not allow for null values

mis_builder/__openerp__.py

@@ -16,7 +16,6 @@
         'account',
         'report_xlsx',  # OCA/reporting-engine
         'date_range',  # OCA/server-tools
-        'web_widget_color',  # OCA/web
     ],
     'data': [
         'wizard/mis_builder_dashboard.xml',

mis_builder/views/mis_builder.xml

@@ -113,8 +113,8 @@
                 <form>
                     <group>
                         <field name="name" />
-                        <field name="color" widget="color" />
-                        <field name="background_color" widget="color" />
+                        <field name="color" />
+                        <field name="background_color" />
                         <field name="font_style" />
                         <field name="font_weight" />
                         <field name="font_size" />