_diff_options: Restore -w completion lost in workers/43351

ChangeLog

@@ -1,3 +1,9 @@
+2020-02-06  dana  <dana@dana.is>
+
+	* Martin von Wittich: 45388 (tweaked):
+	Completion/Unix/Type/_diff_options: Restore -w completion lost
+	in workers/43351
+
 2020-02-03  Daniel Shahaf  <danielsh@apache.org>
 
 	* 45368: Test/B01cd.ztst, Test/D02glob.ztst: Add tests for

Completion/Unix/Type/_diff_options

@@ -92,6 +92,7 @@ if _pick_variant -r variant -c $cmd gnu=GNU unix -v || [[ $OSTYPE = freebsd<12->
     '--ignore-file-name-case[ignore case when comparing file names]' \
     '!(--ignore-file-name-case)--no-ignore-file-name-case' \
     '(-b --ignore-space-change)'{-b,--ignore-space-change}'[ignore changes in the amount of white space]' \
+    '(-w --ignore-all-space)'{-w,--ignore-all-space}'[ignore all white space]' \
     '(-B --ignore-blank-lines)'{-B,--ignore-blank-lines}'[ignore lines that are all blank]' \
     '(-I --ignore-matching-lines)'{-I+,--ignore-matching-lines=}'[ignore lines that match regex]:line exclusion regex:' \
     '--strip-trailing-cr[strip trailing carriage return on input]' \