Run every terminal launch through one dispatcher with fallbacks

session/uwsm/default

@@ -1,2 +1,2 @@
-export TERMINAL=xdg-terminal-exec
+export TERMINAL=blob-terminal-exec
 export EDITOR="blob-launch-editor --inline"

session/uwsm/env.d/10-blob

@@ -3,7 +3,7 @@
 if [ -f "${BLOB_PATH%/}/session/uwsm/default" ]; then
   . "${BLOB_PATH%/}/session/uwsm/default"
 else
-  export TERMINAL=xdg-terminal-exec
+  export TERMINAL=blob-terminal-exec
   export EDITOR="blob-launch-editor --inline"
 fi