Clear out unused server props

Only use the server properties the panel cares about.

minecraft_java/server.properties

@@ -1,38 +1,3 @@
 #Minecraft server properties
-#(File Modification Datestamp)
-generator-settings=
-op-permission-level=4
-allow-nether=true
-enforce-whitelist=false
-level-name=world
-enable-query=false
-allow-flight=false
-prevent-proxy-connections=false
 server-port=25565
-max-world-size=29999984
-level-type=DEFAULT
-enable-rcon=false
-level-seed=
-force-gamemode=false
 server-ip=
-network-compression-threshold=256
-max-build-height=256
-spawn-npcs=true
-white-list=false
-spawn-animals=true
-hardcore=false
-snooper-enabled=true
-resource-pack-sha1=
-online-mode=true
-resource-pack=
-pvp=true
-difficulty=1
-enable-command-block=false
-gamemode=0
-player-idle-timeout=0
-max-players=20
-max-tick-time=60000
-spawn-monsters=true
-view-distance=10
-generate-structures=true
-motd=A Minecraft Server