[FIX] l10n_ch_qr_no_amount: Do not encode amount in QR code

As the context key was not set, the QR code did still include amount
information although it is not printed on the QR bill.

l10n_ch_qr_no_amount/report/swissqr_no_amount_report.py

@@ -5,3 +5,8 @@ class ReportSwissNoAmountQR(models.AbstractModel):
     _name = "report.l10n_ch_qr_no_amount.qr_no_amount_report_main"
     _inherit = "report.l10n_ch.qr_report_main"
     _description = "QR-No-Amount-bill"
+
+    @api.model
+    def _get_report_values(self, docids, data=None):
+        self = self.with_context(_no_amount_qr_code=True)
+        return super()._get_report_values(docids, data)