[GEOPY-2137] in ui.json, correct inversion_type from "fem" to "fdem"

Author: sebhmg

simpeg_drivers-assets/uijson/fem_forward.ui.json

@@ -8,7 +8,7 @@
     "geoh5": "",
     "monitoring_directory": "",
     "workspace_geoh5": "",
-    "inversion_type": "fem",
+    "inversion_type": "fdem",
     "physical_property": "conductivity",
     "forward_only": true,
     "data_object": {

simpeg_drivers-assets/uijson/fem_inversion.ui.json

@@ -8,7 +8,7 @@
     "geoh5": "",
     "monitoring_directory": "",
     "workspace_geoh5": "",
-    "inversion_type": "fem",
+    "inversion_type": "fdem",
     "physical_property": "conductivity",
     "forward_only": false,
     "data_object": {