typo bug-fix (#433)

Author: waltsims

kwave/options/simulation_options.py

@@ -109,8 +109,8 @@ class SimulationOptions(object):
     radial_symmetry: str = "WSWA-FFT"
     multi_axial_PML_ratio: float = 0.1
     data_path: Optional[str] = field(default_factory=lambda: gettempdir())
-    output_filename: Optional[str] = field(default_factory=lambda: f"{get_date_string()}_kwave_input.h5")
-    input_filename: Optional[str] = field(default_factory=lambda: f"{get_date_string()}_kwave_output.h5")
+    input_filename: Optional[str] = field(default_factory=lambda: f"{get_date_string()}_kwave_input.h5")
+    output_filename: Optional[str] = field(default_factory=lambda: f"{get_date_string()}_kwave_output.h5")
     pml_x_alpha: Optional[float] = None
     pml_y_alpha: Optional[float] = None
     pml_z_alpha: Optional[float] = None