Fixes enum value inconsistency

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

Author: GabrielBarberini

src/models/sub/tanks.py

@@ -6,7 +6,7 @@
 class TankKinds(str, Enum):
     LEVEL: str = "LEVEL"
     MASS: str = "MASS"
-    MASS_FLOW: str = "MASSFLOW"
+    MASS_FLOW: str = "MASS_FLOW"
     ULLAGE: str = "ULLAGE"