Stop explicitly blocking Vanilla Method Profiler

At the time this was re-added, there was concern around how the JIT
would handle the system property that enabled it.

This shouldn't be a problem, and as such we no longer need to block
access to it.

The Vanilla Method Profiler will not provide much to most users however
there is no harm in providing it as an option. For most users, the
recommended and supported method for determining performance issues with
Paper will continue to be Timings.

Spigot-Server-Patches/PreCreatureSpawnEvent.patch

@@ -15,7 +15,7 @@ instead and save a lot of server resources.
 See: https://github.com/PaperMC/Paper/issues/917
 
 diff --git a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
-index 87fe4775f..9d580ea01 100644
+index 87fe4775..9d580ea0 100644
 --- a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
 +++ b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
 @@ -0,0 +0,0 @@
@@ -57,7 +57,7 @@ index 87fe4775f..9d580ea01 100644
  
                      if (entity == null) {
 diff --git a/src/main/java/net/minecraft/server/SpawnerCreature.java b/src/main/java/net/minecraft/server/SpawnerCreature.java
-index 2cd063829..e217d3340 100644
+index 2cd06382..e217d334 100644
 --- a/src/main/java/net/minecraft/server/SpawnerCreature.java
 +++ b/src/main/java/net/minecraft/server/SpawnerCreature.java
 @@ -0,0 +0,0 @@ public final class SpawnerCreature {