Remove unused arg for HashMethods#mocha_inspect

This was introduced in this commit [1] apparently as a precursor to the
addition of ParameterMatchers::HasKeys in this commit [2]. However, the
latter only actually used the new optional `wrapped` argument when
calling ArrayMethods#mocha_inspect, and so I think the change to
HashMethods#mocha_inspect was unnecessary.

Since HashMethods#mocha_inspect is not a published part of the API, this
shouldn't require a major version bump.

Thanks to @wasabigeek for highlighting [3] this issue in
wasabigeek#2.

[1]: d8f44bc
[2]: 18d8104
[3]: https://github.com/wasabigeek/mocha/pull/2/files#r989194611

lib/mocha/inspect.rb

@@ -18,9 +18,9 @@ def mocha_inspect(wrapped = true)
     end
 
     module HashMethods
-      def mocha_inspect(wrapped = true)
+      def mocha_inspect
         unwrapped = collect { |key, value| "#{key.mocha_inspect} => #{value.mocha_inspect}" }.join(', ')
-        wrapped ? "{#{unwrapped}}" : unwrapped
+        "{#{unwrapped}}"
       end
     end
 

test/unit/hash_inspect_test.rb

@@ -7,11 +7,6 @@ def test_should_keep_spacing_between_key_value
     assert_equal '{:a => true}', hash.mocha_inspect
   end
 
-  def test_should_return_unwrapped_hash_when_wrapped_is_false
-    hash = { :a => true }
-    assert_equal ':a => true', hash.mocha_inspect(false)
-  end
-
   def test_should_use_mocha_inspect_on_each_item
     hash = { :a => 'mocha' }
     assert_equal %({:a => "mocha"}), hash.mocha_inspect