No need to use "-r .latexmkrc" for latexmk command

because latexmk will use .latexmkrc file in the working directory
without needing to be prompted to do so.
In fact, the "-r" argument was causing latexmk to emit a warning,
so we are better of without it.

chertex.sh

@@ -344,10 +344,13 @@ if $maintrack; then
    fi
 
 	# Run pdflatex, bibtex, and company
+   # Leaving this if-else for historical reasons, and also to print the message
    if $ltxmkrc; then
-      msg "${On_Cyan}<cheRTeX> Calling LaTeXMK with RC file${NOFORMAT}"
+      msg "${On_Cyan}<cheRTeX> Calling LaTeXMK, detected .latemxkrc file${NOFORMAT}"
       simpledelay.sh 2
-      latexmk -r .latexmkrc -pdf -bibtex $jobname
+      # note: latexmk does not need us to invoke "-r .latexmkrc", it finds and uses 
+      # the RC file automatically (as evidenced by latexmk's output)
+      latexmk -pdf -bibtex $jobname
    else
 	   msg "${On_Cyan}<cheRTeX> Calling LaTeXMK${NOFORMAT}"
       simpledelay.sh 2