[macros] Remove \xspace from \opt

Author: jensmaurer

source/macros.tex

@@ -176,7 +176,7 @@
 \newcommand{\CppIII}{\Cpp{} 2003}
 \newcommand{\CppXI}{\Cpp{} 2011}
 \newcommand{\CppXIV}{\Cpp{} 2014}
-\newcommand{\opt}{{\ensuremath{_\mathit{opt}}}\xspace}
+\newcommand{\opt}{{\ensuremath{_\mathit{opt}}}}
 \newcommand{\dcr}{-{-}}
 \newcommand{\bigoh}[1]{\ensuremath{\mathscr{O}(#1)}}