grafik: Fix Makefile for generating flat images.

By default the Makefile did remove the .svg files.

grafik/bilder-einzeln/flat/Makefile

@@ -23,7 +23,8 @@ PNG_TARGETS=$(addsuffix .png, ${BASENAMES})
 
 SOURCES = generate-graphics.py replacements.py base.svg.template
 
-default: all cleansvg cleanpycache
+default: all cleanpycache
+all: svg-path svg pdf png
 
 svg-path: ${SVG_PATH_TARGETS}
 svg: ${SVG_TARGETS}
@@ -50,8 +51,6 @@ png: ${PNG_TARGETS}
 	inkscape --export-filename=$@ --export-height=183 $<
 	optipng $@
 
-all: svg-path svg pdf png
-
 cleansvgpath:
 	rm -f ${SVG_PATH_TARGETS}