fix: follow-ups to cherry-picked d3d7c328b

- src/xmpp/jid.c: add missing #include "log.h" — d3d7c328b
  introduced a log_debug() call in jid_create without pulling in
  the header, so the source tree did not actually build.

- src/omemo/omemo.c omemo_on_message_send: add the missing
  NULL-check after the gcry_malloc_secure calls for 'tag' /
  'key_tag' so a real OOM does not sail into the memcpy/encrypt
  path. (The 'key' check d3d7c328b added is defensive only —
  gcry_random_bytes_secure aborts internally on failure.)

- src/omemo/omemo.c _cache_device_identity: drop the second
  'if (!fingerprint) return' on the autocomplete path. fingerprint
  is already NULL-checked at the top of the function and is not
  reassigned in between, so the second guard is dead code (upstream
  artefact).

- src/tools/editor.c launch_editor: replace the
  g_main_context_acquire/release pair with
  g_child_watch_source_new(getpid()) + g_source_unref.
  acquire/release does not install GLib's SIGCHLD handler — that
  handler is registered as a side effect of constructing a
  GChildWatchSource. Now we actually pre-arm SIGCHLD before
  forking, which is what d3d7c328b's comment claimed.

- src/ui/statusbar.c status_bar_inactive / _create_tab: switch the
  remaining two literal '10' tab-id values to the CONSOLE_TAB_ID
  define introduced by d3d7c328b, then inline the expression
  directly into the GINT_TO_POINTER() argument so the one-shot
  local 'true_win' goes away.

Verified with ci-build.sh in Debian docker: all 4 configs pass
(644/0, 605/0, 605/0, 644/0 unit + 130/0 functional).

src/tools/editor.c

@@ -121,11 +121,11 @@ launch_editor(gchar* initial_content, void (*callback)(gchar* content, void* dat
 
     ui_suspend();
 
-    // Ensure GLib's SIGCHLD handler is installed before forking to prevent
-    // zombie children if the editor is launched before the main loop starts.
-    GMainContext* main_ctx = g_main_context_default();
-    g_main_context_acquire(main_ctx);
-    g_main_context_release(main_ctx);
+    // Force GLib to install its SIGCHLD handler before forking. Creating a
+    // GChildWatchSource for our own pid is the documented trigger; we never
+    // attach or dispatch it, just rely on the side effect.
+    GSource* sigchld_warmup = g_child_watch_source_new(getpid());
+    g_source_unref(sigchld_warmup);
 
     pid_t pid = fork();
     if (pid == -1) {