qml: fix lnurl-pay when config.BTC_AMOUNTS_ADD_THOUSANDS_SEP is True

when paying an lnurl-pay that provides an amount interval,
the amount field is editable by the user and it expects no spaces

electrum/gui/qml/components/LnurlPayRequestDialog.qml

@@ -64,7 +64,7 @@ ElDialog {
                 BtcField {
                     id: amountBtc
                     Layout.preferredWidth: rootLayout.width /3
-                    text: Config.formatSats(invoiceParser.lnurlData['min_sendable_sat'])
+                    text: Config.formatSatsForEditing(invoiceParser.lnurlData['min_sendable_sat'])
                     enabled: invoiceParser.lnurlData['min_sendable_sat'] != invoiceParser.lnurlData['max_sendable_sat']
                     color: Material.foreground // override gray-out on disabled
                     fiatfield: amountFiat

electrum/gui/qml/qeconfig.py

@@ -211,6 +211,15 @@ class QEConfig(AuthMixin, QObject):
             self.config.GUI_QML_USER_KNOWS_PRESS_AND_HOLD = userKnowsPressAndHold
             self.userKnowsPressAndHoldChanged.emit()
 
+    @pyqtSlot('qint64', result=str)
+    @pyqtSlot(QEAmount, result=str)
+    def formatSatsForEditing(self, satoshis):
+        if isinstance(satoshis, QEAmount):
+            satoshis = satoshis.satsInt
+        return self.config.format_amount(
+            satoshis,
+            add_thousands_sep=False,
+        )
 
     @pyqtSlot('qint64', result=str)
     @pyqtSlot('qint64', bool, result=str)