[FIX] product: always compute zoomable with bin_size=False

Changing a product template's image with the `can_image_1024_be_zoomed`
field present in the view produces a crash on save.

**STEPS TO REPRODUCE**
1. Open a product form view
2. Using studio, add the `can_image_1024_be_zoomed` field
3. Change the image and save

The product will be updated, but this error will be thrown:

```
binascii.Error: Incorrect padding
```

**CAUSE**
https://github.com/odoo/odoo/blob/a74684777c27e26639b75b0668bb15afadb78c4f/addons/product/models/product_template.py#L186-L188

In the `RecordSet`'s context, `bin_size=True`, so accessing
`image_<size>` returns a size instead of a binary.
`_compute_can_image_1024_be_zoomed` calls `tools.is_image_size_above`
with this binary size, while the method expects the full base64 encoded
image. Ultimately, this causes `base64.b64decode` to crash with the
above error.

**FIX** Update the `RecordSet`'s context to `bin_size=False`. Accessing
`image_<size>` from the `RecordSet` will then return the full binary
instead of the size.

**NOTES**
In versions <17.0, read and write were done in separate network calls
causing the recompute to happen during the flush of the write, which
doesn't have `bin_size=True` in the context. Because the field is
stored, the read will not cause a recompute and thus avoids any error.
In >=17.0, because the read occurs before the flush, and the write has
invalidated the field, the recompute will occur with the context of the
read (`bin_size=True`), causing the issue.

opw-4413647

closes odoo#192409

X-original-commit: 998f02c
Signed-off-by: Samiul Hoque (saho) <saho@odoo.com>

Author: saho-odoo

addons/product/models/product_template.py

@@ -197,7 +197,7 @@ def _compute_product_document_count(self):
 
     @api.depends('image_1920', 'image_1024')
     def _compute_can_image_1024_be_zoomed(self):
-        for template in self:
+        for template in self.with_context(bin_size=False):
             template.can_image_1024_be_zoomed = template.image_1920 and is_image_size_above(template.image_1920, template.image_1024)
 
     @api.depends(