Revert "20240513 - remove chapter and section numbering in running head"

This reverts commit 3ea5791.

krantz.cls

@@ -350,12 +350,12 @@
 \top@cornermarks
   {\@the@page\RunningHeadFont
     \hfill
-\if@mainmatter\ifnum\value{chapter}>0 \fi\fi\leftmark
+\if@mainmatter\ifnum\value{chapter}>0 \thechapter\enspace\fi\fi\leftmark
     }}
 \def\odd@head{%
 \top@cornermarks
   \hfil{\RunningHeadFont
-\if@mainmatter\ifnum\value{section}>0 \fi\fi\rightmark
+\if@mainmatter\ifnum\value{section}>0 \thesection\enspace\fi\fi\rightmark
     }
 \hfill
     \@the@page
@@ -375,7 +375,7 @@
 \let\@oddfoot\@empty
 \let\@evenfoot\@empty
     \let\@evenhead\even@head
-    \def\@oddhead{\RunningHeadFont\if@mainmatter\ifnum\value{section}>0 \fi\fi\rightmark\hfill\PageNumFont\thepage}%\odd@head
+    \def\@oddhead{\RunningHeadFont\if@mainmatter\ifnum\value{section}>0 \enspace\fi\fi\rightmark\hfill\PageNumFont\thepage}%\odd@head
   \fi
   }
 \else
@@ -449,7 +449,7 @@
       ##1}{}}%
   \def\sectionmark##1{%\pagebreak[3]%
     \markright{%
-      ##1}}}
+      \thesection\enspace##1}}}
 \def\pdfon{\@pdftrue}
 \def\pdfoff{\@pdffalse}
 \if@pdf
@@ -1807,4 +1807,4 @@
 \HeadingsChapterSection
 \endinput
 %%
-%% End of file `krantz.cls'.
+%% End of file `krantz.cls'.