Update fn_validate

Made a custom change for 7 Days To Die.  If user wants or has Alloc's server fixes installed, they need to set the variable in the sdtdserver script to true and then the added coded in fn_validate will now download and install Alloc's fixes automatically.
Could possibly be put in a separate file and called by a function, but validate isn't run constantly so the extra few lines of code shouldn't matter.

functions/fn_validate

@@ -26,7 +26,7 @@ cd "steamcmd"
 fn_scriptlog "Checking complete"
 
 # addition for 7 Days to Die - very popular server addon run on most dedicated servers
-# file validation breaks the mod and it needs reinstalling.
+# file validation breaks this addon and it requires re-installation each time.
 if [ "${allocsfixes}" = true ]; then
         sleep 5
         fn_scriptlog "Installing Alloc's Server Fixes"