removed unused settings.

paperless.conf.example

@@ -44,7 +44,6 @@
 #PAPERLESS_CONSUMER_DELETE_DUPLICATES=false
 #PAPERLESS_CONVERT_MEMORY_LIMIT=0
 #PAPERLESS_CONVERT_TMPDIR=/var/tmp/paperless
-#PAPERLESS_CONVERT_DENSITY=300
 #PAPERLESS_OPTIMIZE_THUMBNAILS=true
 #PAPERLESS_POST_CONSUME_SCRIPT=/path/to/an/arbitrary/script.sh
 #PAPERLESS_FILENAME_DATE_ORDER=YMD
@@ -54,5 +53,4 @@
 
 #PAPERLESS_CONVERT_BINARY=/usr/bin/convert
 #PAPERLESS_GS_BINARY=/usr/bin/gs
-#PAPERLESS_UNPAPER_BINARY=/usr/bin/unpaper
 #PAPERLESS_OPTIPNG_BINARY=/usr/bin/optipng