chore: drop an incomplete comment

Signed-off-by: Yukai Chou <[email protected]>

Author: muzimuzhi

tex/generic/pgf/modules/pgfmoduleplot.code.tex

@@ -490,7 +490,7 @@
     \pgfutil@read\pgfutil@inputcheck to\pgf@temp% ignored
     \pgfutil@read\pgfutil@inputcheck to\pgf@plot@line%
     \closein\pgfutil@inputcheck
-    \edef\pgf@plot@code{\pgfutil@trimspaces@e{#2}}% in case of leading spaces
+    \edef\pgf@plot@code{\pgfutil@trimspaces@e{#2}}%
     \ifx\pgf@plot@code\pgf@plot@line%
       \openin\pgfutil@inputcheck=\pgfretval\relax
       \ifeof\pgfutil@inputcheck%