Remove centering for floats (#364)

This was a bad idea...:
https://tex.stackexchange.com/questions/2651/should-i-use-center-or-centering-for-figures-and-tables

floatrows not sure how it should work with flowcharts... so we use
centring

I don't want to redefine all floats either as we use them for chapters
title page.

book/flour-types/flour-types.tex

@@ -17,12 +17,11 @@ Depending on which layers are still present, different names are used to describ
 type of flour.
 
 \begin{table}[!htb]
-    \begin{center}
+    \centering
         \input{tables/table-flour-types.tex}
         \caption[Labelling of wheat flour]{A comparison of how different types
             of wheat flour are labelled in different countries.}%
         \label{tab:flour-types-comparison}
-    \end{center}
 \end{table}
 
 In Germany, the ash content is used to describe the flours. The lab will burn
@@ -60,11 +59,10 @@ want the final bread to be too sour. Conversely you do not have to worry about
 the gluten degradation, removing a huge headache from the equation.
 
 \begin{table}[!htb]
-    \begin{center}
+    \centering
         \input{tables/table-grains-bread-making-process.tex}
         \caption[Different types of grain]{An overview of different grain
           types and the steps involved in the respective bread making process.}
-    \end{center}
 \end{table}
 
 Because gluten has a special role, the rest of this chapter is dedicated to having a
@@ -115,13 +113,12 @@ The long fermentation period also means that your microbes will enrich
 your dough with more flavor.
 
 \begin{table}[!htb]
-    \begin{center}
+    \centering
         \input{tables/table-overview-w-values.tex}
         \caption[Fermentation time versus W-value]{An overview of different
             levels of W-values and the respective hydrations and fermentation
             times.}%
         \label{tab:w-value}
-    \end{center}
 \end{table}
 
 Generally, when aiming to