[FW][FIX] account,web: harmonize documents' taxes header display

[fw-bot]

Steps to reproduce:

• In Sales app, create a new invoice with one product;
• Post the invoice without validating it;
• Print invoice without payment from action button.

Issue:
The taxes column's header is "start aligned" as its content and the other columns are "end aligned".

Expected:
Column headers should be harmonized and have a consistent display as per :

odoo/addons/sale/report/ir_actions_report_templates.xml

Lines 79 to 88 in 4d9cf2e

	<th name="th_description" class="text-start">Description</th>
	<th name="th_quantity" class="text-end text-nowrap">Quantity</th>
	<th name="th_priceunit" class="text-end text-nowrap">Unit Price</th>
	<th name="th_discount" t-if="display_discount" class="text-end">
	<span>Disc.%</span>
	</th>
	<th name="th_taxes" class="text-end">Taxes</th>
	<th name="th_subtotal" class="text-end">
	<span>Amount</span>
	</th>

Cause:
The view sets the header alignement on start.

opw-4380680

---

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Forward-Port-Of: #197079
Forward-Port-Of: #193394

[robodoo]

[fw-bot]

@barracudapps @qdp-odoo this PR targets master and is the last of the forward-port chain containing:

• [FW][FIX] account,web: harmonize documents' taxes header display #197097

To merge the full chain, use

@robodoo r+

More info at https://github.com/odoo/odoo/wiki/Mergebot#forward-port

[barracudapps]

@robodoo r+