Remove legacy Heroku memory settings

bin/start

@@ -76,21 +76,4 @@ if [ ! -z "$RDS_HOSTNAME" ]; then
     export MB_DB_PORT=$RDS_PORT
 fi
 
-# Pick sensible memory limits depending on what size Heroku dyno we are on
-limit=$(ulimit -u)
-case $limit in
-512)   # 2X Dyno
-  default_java_mem_opts="-Xmx768m"
-  ;;
-16384) # IX Dyno
-  default_java_mem_opts="-Xmx2g"
-  ;;
-32768) # PX Dyno
-  default_java_mem_opts="-Xmx12g"
-  ;;
-*) #1X Dyno
-  default_java_mem_opts="-Xmx300m -Xss512k"
-  ;;
-esac
-
-exec java $default_java_mem_opts -Dfile.encoding=UTF-8 $JAVA_OPTS -jar ./target/uberjar/metabase.jar
+exec java -Dfile.encoding=UTF-8 $JAVA_OPTS -jar ./target/uberjar/metabase.jar