Common: fix test for printf

pkgs/ruby/spec/lib/kernaux/sprintf_spec.rb

@@ -10,6 +10,12 @@ RSpec.describe KernAux, '.sprintf' do
     it { is_expected.to be_frozen }
     it { is_expected.to eq 'Hello, World!' }
 
+    context 'for empty string value' do
+      subject(:sprintf) { described_class.sprintf ['Hello testing%s'] }
+
+      it { is_expected.to eq 'Hello testing' }
+    end
+
     [
       ['',      'using regular tests'],
       ['_orig', 'using original tests'],

tests/printf_orig.yml

@@ -204,9 +204,6 @@
 
 - result: 'Hello testing'
   args: ['Hello testing']
-- result: 'Hello testing'
-  args: [['Hello testing%s']]
-  fixme: true
 - result: 'Hello testing'
   args: [['Hello testing%s', '']]
 - result: 'Hello testing'