Fix modality.json key naming (use short keys: eef_left, eef_right, cam_frame)

meta/modality.json

@@ -40,17 +40,17 @@
             "start": 41,
             "end": 44
         },
-        "state_eef_left": {
+        "eef_left": {
             "original_key": "observation.state_eef_left",
             "start": 0,
             "end": 9
         },
-        "state_eef_right": {
+        "eef_right": {
             "original_key": "observation.state_eef_right",
             "start": 0,
             "end": 9
         },
-        "state_cam_frame": {
+        "cam_frame": {
             "original_key": "observation.state_cam_frame",
             "start": 0,
             "end": 9
@@ -97,12 +97,12 @@
             "start": 41,
             "end": 44
         },
-        "action_eef_left": {
+        "eef_left": {
             "original_key": "action_eef_left",
             "start": 0,
             "end": 9
         },
-        "action_eef_right": {
+        "eef_right": {
             "original_key": "action_eef_right",
             "start": 0,
             "end": 9