fix fish completions for --config & --log (#3912)

Author: diktomat

contrib/completion/hx.fish

@@ -11,5 +11,5 @@ complete -c hx -s v -o vv -o vvv -d "Increases logging verbosity"
 complete -c hx -s V -l version -d "Prints version information"
 complete -c hx -l vsplit -d "Splits all given files vertically into different windows"
 complete -c hx -l hsplit -d "Splits all given files horizontally into different windows"
-complete -c hx -s c -l config -d "Specifies a file to use for completion"
-complete -c hx -s c -l log -d "Specifies a file to write log data into"
+complete -c hx -s c -l config -r -d "Specifies a file to use for completion"
+complete -c hx -l log -r -d "Specifies a file to write log data into"