[FIX] web: Support integer group name
[FIX] web: Support integer group name

Fixes https://github.com/odoo/odoo/issues/37998
Follow up on https://github.com/odoo/odoo/commit/5c4544fb2943e63fc1e0f5ae1e7e250a5a2b2cf1
As Integer fields are Supported for "Group By", they should be used as Group name

closes odoo/odoo#38007

Signed-off-by: lul-odoo <599b4db49b2a27b2c58167672cb5d8a2f68d5b5a@users.noreply.github.com>

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