Make code-block-font-size not affect inline listings (#229)

When using listings, the variable `code-block-font-size`
also affected `lstinline` environments.
This will make inline listings follow the surronding font size, as expected.

eisvogel.tex

@@ -725,7 +725,10 @@
   framexleftmargin = 2.5em,
 $endif$
   backgroundcolor  = \color{listing-background},
-  basicstyle       = \color{listing-text-color}\linespread{1.0}$if(code-block-font-size)$$code-block-font-size$$else$\small$endif$\ttfamily{},
+  basicstyle       = \color{listing-text-color}\linespread{1.0}%
+                      \lst@ifdisplaystyle%
+                      $if(code-block-font-size)$$code-block-font-size$$else$\small$endif$%
+                      \fi\ttfamily{},
   breaklines       = true,
   frame            = single,
   framesep         = 0.19em,