[autotools] Fix install wrong paths.

Thanks to Mladen Jurak for the heads up and the
provided fix.
(reviewed by timok)


git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@13709 2fb0f335-1f38-0410-981e-8018bf24f1b0

dumux/implicit/box/Makefile.am

-commondir = $(includedir)/dumux/implicit/common
-common_HEADERS := $(wildcard *.hh)
+boxdir = $(includedir)/dumux/implicit/box
+box_HEADERS := $(wildcard *.hh)
 
 include $(top_srcdir)/am/global-rules

dumux/implicit/cellcentered/Makefile.am

-commondir = $(includedir)/dumux/ccmodels/common
-common_HEADERS := $(wildcard *.hh)
+cellcentereddir = $(includedir)/dumux/implicit/cellcentered
+cellcentered_HEADERS := $(wildcard *.hh)
 
 include $(top_srcdir)/am/global-rules