Remove param from CommitRange#to_s

app/models/commit_range.rb

@@ -67,12 +67,8 @@ class CommitRange
     end
   end
 
-  def to_s(short: true)
-    if short
+  def to_s
     "#{sha_from[0..7]}#{notation}#{sha_to[0..7]}"
-    else
-      "#{sha_from}#{notation}#{sha_to}"
-    end
   end
 
   # Returns a String for use in a link's title attribute

spec/models/commit_range_spec.rb

@@ -39,7 +39,6 @@ describe CommitRange do
   end
 
   describe '#to_s' do
-    context 'with short IDs' do
     it 'is correct for three-dot syntax' do
       expect(range.to_s).to eq "#{sha_from[0..7]}...#{sha_to[0..7]}"
     end
@@ -49,17 +48,6 @@ describe CommitRange do
     end
   end
 
-    context 'with full IDs' do
-      it 'is correct for three-dot syntax' do
-        expect(range.to_s(short: false)).to eq "#{sha_from}...#{sha_to}"
-      end
-
-      it 'is correct for two-dot syntax' do
-        expect(range2.to_s(short: false)).to eq "#{sha_from}..#{sha_to}"
-      end
-    end
-  end
-
   describe '#reference_title' do
     it 'returns the correct String' do
       expect(range.reference_title).to eq "Commits #{sha_from} through #{sha_to}"