fix: split private modes in car, sustainable and general

Author: rebecamurillo

src/sum_impact_assessment/utils/modal_split.py

@@ -12,9 +12,11 @@
 # Value: one or more transport mode types used as filter
 MODAL_SPLIT_TRANSPORT_MODE_GROUPS: Dict[str, List[str]] = {
     "NSM": ["NSM"],
-    "Private": ["PRIVATE"],
+    "All private modes": ["PRIVATE", "PRIVATE_SUSTAINABLE", "PRIVATE_CAR"],
+    "Sustainable private modes": ["PRIVATE_SUSTAINABLE"],
+    "Private car": ["PRIVATE_CAR"],
     "Public transport": ["PUBLIC_TRANSPORT"],
-    "PT+NSM": ["NSM", "PUBLIC_TRANSPORT"],
+    "Public Transport with NSM": ["NSM", "PUBLIC_TRANSPORT"],
 }