[macros] Define \exposconcept in terms of \exposconceptx.

This avoids duplicating the main definition.

Author: tkoeppe

source/macros.tex

@@ -517,8 +517,8 @@
 \newcommand{\libconceptx}[2]{\cname{#1}\indexconcept{\idxconcept{#2}}}
 \newcommand{\libconcept}[1]{\libconceptx{#1}{#1}}
 \newcommand{\deflibconcept}[1]{\cname{#1}\indexlibrary{\idxconcept{#1}}\indexconcept{\idxconcept{#1}|idxbfpage}}
-\newcommand{\exposconcept}[1]{\ecname{#1}\indexconcept{\idxexposconcept{#1}}}
 \newcommand{\exposconceptx}[2]{\ecname{#1}\indexconcept{\idxexposconcept{#2}}}
+\newcommand{\exposconcept}[1]{\exposconceptx{#1}{#1}}
 \newcommand{\exposconceptnc}[1]{\indexconcept{\idxexposconcept{#1}}\ecname{#1}\itcorr[-1]}               % macro length: 15
 \newcommand{\defexposconcept}[1]{\ecname{#1}\indexconcept{\idxexposconcept{#1}|idxbfpage}}               % macro length: 16
 \newcommand{\defexposconceptnc}[1]{\ecname{#1}\indexconcept{\idxexposconcept{#1}|idxbfpage}\itcorr[-1]}  % macro length: 18