org-odt: Rename style `OrgSourceBlock' to `OrgFixedWidthBlock'

* contrib/odt/styles/OrgOdtStyles.xml: Rename the style
`OrgSourceBlock' to `OrgFixedWidthBlock'.
* contrib/lisp/org-odt.el
(org-export-odt-default-org-styles-alist): Map fixedwidth
paragraphs to the custom style `OrgFixedWidthBlock'.
(org-odt-format-line, org-odt-format-source-code-or-example):
Style both fixedwidth paragraphs and src/example blocks in
fixedwidth format.

contrib/lisp/org-odt.el

@@ -227,7 +227,7 @@ be linked only."
 
 (defvar org-export-odt-default-org-styles-alist
   '((paragraph . ((default . "Text_20_body")
-		  (fixedwidth . "OrgSourceBlock")
+		  (fixedwidth . "OrgFixedWidthBlock")
 		  (verse . "OrgVerse")
 		  (quote . "Quotations")
 		  (blockquote . "Quotations")
@@ -834,8 +834,8 @@ PUB-DIR is set, use this as the publishing directory."
   (case org-lparse-dyn-current-environment
     (fixedwidth (concat
 		 (org-odt-format-stylized-paragraph
-		  'src (org-odt-fill-tabs-and-spaces
-			(org-xml-encode-plain-text line))) "\n"))
+		  'fixedwidth (org-odt-fill-tabs-and-spaces
+			       (org-xml-encode-plain-text line))) "\n"))
     (t (concat line "\n"))))
 
 (defun org-odt-format-comment (fmt &rest args)
@@ -859,7 +859,7 @@ PUB-DIR is set, use this as the publishing directory."
   (mapconcat
    (lambda (line)
      (org-odt-format-stylized-paragraph
-      'src (org-odt-fill-tabs-and-spaces line)))
+      'fixedwidth (org-odt-fill-tabs-and-spaces line)))
    (org-split-string lines "[\r\n]") "\n"))
 
 (defun org-xml-encode-plain-text-lines (rtn)

contrib/odt/styles/OrgOdtStyles.xml

@@ -244,11 +244,13 @@
     <style:background-image/>
    </style:paragraph-properties>
   </style:style>
-  <style:style style:name="OrgSourceBlock" style:family="paragraph" style:parent-style-name="Preformatted_20_Text">
+
+  <style:style style:name="OrgFixedWidthBlock" style:family="paragraph" style:parent-style-name="Preformatted_20_Text">
    <style:paragraph-properties fo:background-color="#c0c0c0" fo:padding="0.049cm" fo:border="0.018cm solid #000000" style:shadow="none">
     <style:background-image/>
    </style:paragraph-properties>
   </style:style>
+
   <style:style style:name="OrgCenter" style:family="paragraph" style:parent-style-name="Text_20_body">
    <style:paragraph-properties fo:text-align="center" style:justify-single-word="false"/>
   </style:style>