remove additional newline from the textwrap.dedent string

Signed-off-by: devops117 <55235206+devops117@users.noreply.github.com>

ldm/invoke/model_cache.py

@@ -334,7 +334,7 @@ class ModelCache(object):
         '''
         Returns the preamble for the config file.
         '''
-        return textwrap.dedent('''
+        return textwrap.dedent('''\
             # This file describes the alternative machine learning models
             # available to InvokeAI script.
             #