Revert "fish: functions: Open dot graphs by default in xdot"

This reverts commit a827d25ac4.

xdot has been giving us problem with GStreamer dot graphs. May be
it is a bug with GStreamer but let us just use vimiv henceforth.

fish/.config/fish/functions/dotP.fish

@@ -4,5 +4,4 @@ function dotP --description 'Generate Pipewire dot graph for all nodes'
     if test "$argv[1]" = -c
         dot -Tsvg $output.dot >$output.svg
     end
-    xdot $output.dot &
 end

fish/.config/fish/functions/dotg.fish

@@ -10,6 +10,5 @@ function dotg --description 'Generate gstreamer dot graph for selected file'
     if test -n "$result"
         dot -Tsvg "$result" -O
         mv "$result".svg ~/Pictures/gstreamer
-        xdot $result &
     end
 end

fish/.config/fish/functions/dotp.fish

@@ -4,5 +4,4 @@ function dotp --description 'Generate Pipewire dot graph for linked nodes'
     if test "$argv[1]" = -c
         dot -Tsvg $output.dot >$output.svg
     end
-    xdot $output.dot &
 end