Fixes ZPE extraction when 'Eh' is present

Addresses an issue where the zero-point energy (ZPE) extraction fails when the "Eh" unit is explicitly present in the line.

Improves the parsing logic to correctly identify and extract the ZPE value, regardless of whether the "Eh" unit is present or not.

Author: calvinp0

arc/parser/adapters/orca.py

@@ -224,7 +224,11 @@ def parse_zpe_correction(self) -> Optional[float]:
                 if 'Zero point energy' in line:
                     # Example: Zero point energy      ...    0.025410 Eh
                     try:
-                        zpe = float(line.split()[-2])
+                        parts = line.split()
+                        if 'Eh' in parts:
+                            zpe = float(parts[parts.index('Eh') - 1])
+                        else:
+                            zpe = float(parts[-2])
                         break
                     except (ValueError, IndexError):
                         continue