Rename option name from "Invoice number" to "Invoice Number"

This ensures it matches all other invoice reports.

gnucash/report/reports/standard/receipt.scm

@@ -41,7 +41,6 @@
 (define generalpage  gnc:pagename-general)
 ; option names
 (define optname-report-title   (N_ "Report title"))
-(define optname-invoice-number (N_ "Invoice number"))
 (define optname-template-file  (N_ "Template file"))
 (define optname-css-file       (N_ "CSS stylesheet file"))
 (define optname-heading-font   (N_ "Heading font"))
@@ -73,7 +72,7 @@
 
   (add-option
     (gnc:make-invoice-option ; defined in gnucash/scm/business-options.scm
-      generalpage optname-invoice-number
+      generalpage gnc:optname-invoice-number
       "a" "" (lambda () '()) #f))
 
   ;; Display options
@@ -164,7 +163,7 @@
 
   ; Get all the options
   (let* ((document                  (gnc:make-html-document))
-         (opt-invoice               (opt-value generalpage  optname-invoice-number))
+         (opt-invoice               (opt-value generalpage gnc:optname-invoice-number))
          (opt-template-file         (find-template
                                       (opt-value displaypage optname-template-file)))
          (opt-css-file              (find-stylesheet

libgnucash/app-utils/options.scm

@@ -1832,6 +1832,8 @@ the option '~a'."))
       ("Links" #f "Transaction Links")
       ;; invoice.scm, renamed November 2018
       ("Individual Taxes" #f "Use Detailed Tax Summary")
+      ;; receipt.scm, renamed July 2021
+      ("Invoice number" #f "Invoice Number")
       ;; income-gst-statement.scm
       ("default format" #f "Default Format")
       ("Report format" #f "Report Format")