transform shape clashes with label position #843

In the old code the conditional `\iftikz@label@simple' was set to true
when `transform shape' was in place. I do not understand the reason for
this at all. Honestly I also don't really understand large parts of the
rest of the code. It seems as if `\iftikz@label@simple' will only ever
be true when the label anchor coincides with the center anchor, which is
only ever true for nodes of type coordinate.

tex/generic/pgf/frontendlayer/tikz/tikz.code.tex

@@ -790,13 +790,9 @@
       \pgf@xc=\pgf@x%
       \pgf@yc=\pgf@y%
       \tikz@label@simplefalse%
-      \iftikz@fullytransformed%
-        \tikz@label@simpletrue%
-      \else
-        \ifdim\pgf@xc=\pgf@xb\relax%
-          \ifdim\pgf@yc=\pgf@yb\relax%
-            \tikz@label@simpletrue%
-          \fi%
+      \ifdim\pgf@xc=\pgf@xb\relax%
+        \ifdim\pgf@yc=\pgf@yb\relax%
+          \tikz@label@simpletrue%
         \fi%
       \fi%
       \iftikz@label@simple%