Add missing % in apaauthor

[moewew]

Adds a missing %s in apaauthor and normalises the indentation.

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The usage of \printtext within a name format can cause quite undesirable effects, so I would recommend to get rid of them. Unfortunately, that means that you can't use \setunit and friends either and have to check for empty contents manually.

Example of undesirable effect

\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{csquotes}

\usepackage[style=apa, backend=biber]{biblatex}

\DeclareDelimFormat*{multinamedelim}{\slash} 
\DeclareDelimFormat*{finalnamedelim}{} 
\DeclareDelimAlias{finalnamedelim}{multinamedelim} 
\DeclareDelimFormat*{finalnamedelim:apa:family-given}{}
\DeclareDelimAlias{finalnamedelim:apa:family-given}{multinamedelim}

\addbibresource{biblatex-examples.bib}

\begin{document}
\cite{sigfridsson}
\printbibliography
\end{document}