Fix RTL detection on Ruby side (#3867)

This fixes below bugs:

* pipe characters being counted as RTL character
* only first word being checked

spec/helpers/stream_entries_helper_spec.rb

@@ -217,7 +217,7 @@ RSpec.describe StreamEntriesHelper, type: :helper do
     end
 
     it 'is true if right to left characters are greater than 1/3 of total text' do
-      expect(helper).to be_rtl 'aaݟ'
+      expect(helper).to be_rtl 'aaݟaaݟ'
     end
   end
 end