base: remove redundant allowed content type for Solver Type

This is already defined in erp5_simulation, also Solver Type does not
exist in erp5_base

bt5/erp5_base/PortalTypeAllowedContentTypeTemplateItem/allowed_content_types.xml

@@ -129,7 +129,4 @@
  <portal_type id="Rounding Tool">
   <item>Rounding Model</item>
  </portal_type>
- <portal_type id="Solver Tool">
-  <item>Solver Type</item>
- </portal_type>
 </allowed_content_type_list>
\ No newline at end of file

bt5/erp5_base/bt/template_portal_type_allowed_content_type_list

@@ -87,5 +87,4 @@ Person | Fax
 Person | Link
 Person | Telephone
 Query Module | Query
-Rounding Tool | Rounding Model
-Solver Tool | Solver Type
\ No newline at end of file
+Rounding Tool | Rounding Model
\ No newline at end of file