Removed useless braces to suppress a warning

spec/ruby/library/logger/device/new_spec.rb

@@ -41,7 +41,7 @@ describe "Logger::LogDevice#new" do
 
   it "receives options via a hash as second argument" do
     -> { Logger::LogDevice.new(STDERR,
-                                   { shift_age: 8, shift_size: 10
+                               shift_age: 8, shift_size: 10
-                                   })}.should_not raise_error
+                              )}.should_not raise_error
   end
 end