Add: (defface org-ql-view-title) Use in -view--header-line-format

Note that we also add a safety check in ORG-QL-VIEW--LINK-FOLLOW,
because the addition of a call to PROPERTIZE in
ORG-QL-VIEW--HEADER-LINE-FORMAT effectively removes what was
functioning as a safety check there (as CONCAT had been signaling an
error for the unsafe argument, whereas PROPERTIZE, which is called to
apply the new face, does not).  We also change the expected error in
the tests accordingly.

org-ql.info

@@ -1095,7 +1095,10 @@ File: README.info,  Node: 09-pre,  Next: 089,  Up: Changelog
 5.1 0.9-pre
 ===========
 
-*Changes*
+*Additions*
+   • Face ‘org-ql-view-title’, applied to view titles in header line.
+
+   *Changes*
    • Command ‘org-ql-find’ respects narrowing of the current buffer by
      default, allowing searching within the narrowed region.  (Using one
      ‘C-u’ argument widens the current buffer, and using two ‘C-u’
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