Fix SC2230

This is the official fix of the schellcheck error SC2230 (https://github.com/koalaman/shellcheck/wiki/SC2230) preventing the tests to succeed on MacOS.

Author: GenieTim

report-bug.sh

@@ -23,12 +23,12 @@ clipboard() {
       copy_cmd=clip
     fi
     # copy_cmd=clip
-  elif which pbcopy >/dev/null 2>&1; then
+  elif command -v pbcopy >/dev/null 2>&1; then
     copy_cmd="pbcopy"
-  elif which xclip >/dev/null 2>&1; then
+  elif command -v xclip >/dev/null 2>&1; then
     # copy_cmd="xclip -i -selection clipboard"
     copy_cmd="xclip"
-  elif which xsel  >/dev/null 2>&1 ; then
+  elif command -v xsel >/dev/null 2>&1 ; then
     local copy_cmd="xsel -b"
   fi
   if [ -n "$copy_cmd" ] ;then