update_payload_cache_size script overwrites dynamic payload values

[bwatters-r7]

When running the update_payload_cache_size script, I noticed it overwrote dynamic payload sizes.

diff --git a/modules/payloads/singles/windows/x64/powershell_bind_tcp.rb b/modules/payloads/singles/windows/x64/powershell_bind_tcp.rb
index f20b0c8125..b71fa81dde 100644
--- a/modules/payloads/singles/windows/x64/powershell_bind_tcp.rb
+++ b/modules/payloads/singles/windows/x64/powershell_bind_tcp.rb
@@ -10,7 +10,8 @@ require 'rex/powershell'
 #
 ###
 module MetasploitModule
-  CachedSize = :dynamic
+
+  CachedSize = 1887

[bwatters-r7]

I once again ask: When has this check ever caught a bug?