pe_inject.rb: Add missing datastore argument

Author: Adrian Șendroiu

lib/msf/core/payload/windows/pe_inject.rb

@@ -44,7 +44,7 @@ def self.assert_compatible(pe, arch)
       end
     end
 
-    def valid?(value, check_empty: nil)
+    def valid?(value, check_empty: nil, datastore: nil)
       return false unless super
       return false unless value && File.file?(File.expand_path(value)) # no memory: locations