Remove redundant writable

Author: Kaushik Ghose

tests/stage_file_array.cwl

@@ -21,4 +21,3 @@ requirements:
     listing:
       - entryname: input_dir
         entry: "${ return {class: 'Directory', listing: inputs.input_list} }"
-        writable: true

tests/stage_file_array_basename.cwl

@@ -20,4 +20,3 @@ requirements:
   - class: InitialWorkDirRequirement
     listing:
       - entry: "${ return {class: 'Directory', basename: 'input_dir', listing: inputs.input_list} }"
-        writable: true

tests/stage_file_array_basename_and_entryname.cwl

@@ -21,4 +21,3 @@ requirements:
     listing:
       - entryname: input_dir
         entry: "${ return {class: 'Directory', basename: 'not_input_dir', listing: inputs.input_list} }"
-        writable: true