[bash-completion] Remove -E option from sed

Old versions of sed does not have -E option

fzf-completion.bash

@@ -159,7 +159,7 @@ if [ "$_fzf_completion_loaded" != '0.8.6' ]; then
   # Really wish I could use associative array but OSX comes with bash 3.2 :(
   eval $(complete | grep '\-F' | grep -v _fzf_ |
     grep -E -w "$(echo $d_cmds $f_cmds $a_cmds | sed 's/ /|/g' | sed 's/+/\\+/g')" |
-    sed -E 's/.*-F *([^ ]*).* ([^ ]*)$/export _fzf_orig_completion_\2=\1;/' |
+    sed 's/.*-F *\([^ ]*\).* \([^ ]*\)$/export _fzf_orig_completion_\2=\1;/' |
     sed 's/[^a-z0-9_= ;]/_/g')
   export _fzf_completion_loaded=0.8.6
 fi