[FIX] web: fix magic grouping on date fields

Date fields have magic grouping methods to specify how to group on
them like date:month, date:weeks, date:days for example. It needs
to be handled properly since date:month is not a valid field name
but date is.

Steps to reproduce the issue:
- Go to Sales/Dashboard
- Click on My Pipeline
- Group by "Creation Month"

Basically, this can be triggred from any view which has a search
view which defines a group using the magic date grouping methods.

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