Fix CWD being removed from path again. Refixes #723 again

Weirdly, I'm not even on a Mac or using a special Python distro.  Just
plain old Debian stable and a plain old venv.

Author: majick

scripts/invoke.py

@@ -11,9 +11,8 @@
 import traceback
 import yaml
 
-from ldm.invoke.prompt_parser import PromptParser
-
 sys.path.append('.')    # corrects a weird problem on Macs
+from ldm.invoke.prompt_parser import PromptParser
 from ldm.invoke.readline import get_completer
 from ldm.invoke.args import Args, metadata_dumps, metadata_from_png, dream_cmd_from_png
 from ldm.invoke.pngwriter import PngWriter, retrieve_metadata, write_metadata