Fix setting of line breakpoints

The problem was simply that I was sending the wrong key for the file
path. Sigh. Also update the ms debugger and fix a traceback.

python3/vimspector/debug_session.py

@@ -232,7 +232,7 @@ class DebugSession( object ):
           'arguments': {
             'source': {
               'name': os.path.basename( file_name ),
-              'file': file_name,
+              'path': file_name,
             },
             'breakpoints': breakpoints,
           },

python3/vimspector/utils.py

@@ -104,5 +104,7 @@ def SelectFromList( prompt, options ):
     if selection < 0 or selection >= len( options ):
       return None
     return options[ selection ]
+  except KeyboardInterrupt:
+    return None
   finally:
     vim.eval( 'inputrestore()' )