Add missing DaemonMode.jl

Project.toml

@@ -1,5 +1,4 @@
 [deps]
-DaemonMode = "d749ddd5-2b29-4920-8305-6ff5a704e36e"
 SymbolicRegression = "8254be44-1295-4e6a-a16d-46603ac705cb"
 
 [compat]

pysr/sr.py

@@ -484,6 +484,7 @@ def _start_julia_daemon(
         return
 
     s = "import Pkg;"
+    s += 'Pkg.add("DaemonMode");'
     if need_install:
         s += "Pkg.instantiate();"
         s += "Pkg.update();"