wolf: fix cemu-sync-controllers silently finding zero joysticks

docker exec needs an explicit -i flag to forward stdin into the
container process; without it, the heredoc piped into `python3 -`
never reached the containerized script, which ran empty and printed
nothing. cemu-sync-controllers then misread that empty output as
"SDL reported zero joysticks" — a false negative with a working set of
4 controllers already confirmed live in ES-DE, not an actual SDL or
GUID problem. Root-caused against the user's own live output: the
exact same probe script, run directly (not via the manage.sh command),
found real device nodes (js0-js4) present in the same container at the
same time cemu-sync-controllers reported zero.

Audited every other docker exec call in this file for the same
stdin-via-heredoc pattern; this was the only one missing -i.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VLX1yYKJExGSXmgUhxKQG6

services/wolf.sh

@@ -4178,7 +4178,7 @@ CLONEPY
         fi
         echo "Reading live controller GUIDs from $_CSC_CONTAINER..."
 
-        _CSC_PROBE=$(docker exec -u retro "$_CSC_CONTAINER" python3 - << 'PROBEPY'
+        _CSC_PROBE=$(docker exec -i -u retro "$_CSC_CONTAINER" python3 - << 'PROBEPY'
 import ctypes, ctypes.util, sys
 
 libname = ctypes.util.find_library("SDL2") or "libSDL2-2.0.so.0"