Fix whitespace

Author: johnnyshields

spec/mongoid/fields_spec.rb

@@ -368,15 +368,15 @@
       context 'when using an unknown symbol' do
         it 'raises InvalidFieldType' do
           lambda do
-            klass.field(:test, type:  :bogus)
+            klass.field(:test, type: :bogus)
           end.should raise_error(Mongoid::Errors::InvalidFieldType, /declares a field 'test' with an unknown :type value :bogus/)
         end
       end
 
       context 'when using an unknown string' do
         it 'raises InvalidFieldType' do
           lambda do
-            klass.field(:test, type:  'bogus')
+            klass.field(:test, type: 'bogus')
           end.should raise_error(Mongoid::Errors::InvalidFieldType, /declares a field 'test' with an unknown :type value "bogus"/)
         end
       end