default creditor name: remove exclamation point for compatibility

The Swiss banking app neon does not accept the exclamation point.
Users need to remove it before they can enter the transaction.

Hence, remove it for compatibility, perhaps other banks or
banking apps are also affected.

cmd/qrbill-api/api.go

@@ -47,7 +47,7 @@ func qrchFromRequest(r *http.Request) *qrbill.QRCH {
 			IBAN: ifEmpty(r.Form, "criban", "CH0209000000870913543"),
 			Cdtr: qrbill.Address{
 				AdrTp:            qrbill.AddressType(ifEmpty(r.Form, "craddrtype", string(qrbill.AddressTypeStructured))),
-				Name:             ifEmpty(r.Form, "crname", "Legalize it!"),
+				Name:             ifEmpty(r.Form, "crname", "Legalize it"),
 				StrtNmOrAdrLine1: ifEmpty(r.Form, "craddr1", "Quellenstrasse"),
 				BldgNbOrAdrLine2: ifEmpty(r.Form, "craddr2", "25"),
 				PstCd:            ifEmpty(r.Form, "crpost", "8005"),