Fix the apply_rec() API for bulk create operations according.

[IGordynskyi]

There were couple of errors seen during the sairec test run with the recording file generated on latest SONiC/SAI source code:

                    # Convert into "sai-object-type:key"
                    key = record[0][1] + ":" + record[idx + 1][0]
                    # Update OIDs in the key
                    key = self.__update_key(rec[0], key)
                    # Convert into ["sai-object-type", "key"]
>                   key = key.split(":", 1)[1]
E                   IndexError: list index out of range
...
Ignored line 131: ['a', 'APPLY_VIEW']
#132: [['A', 'SAI_STATUS_SUCCESS']]
Ignored line 132: ['A', 'SAI_STATUS_SUCCESS']
#133: [['C', 'SAI_OBJECT_TYPE_PORT'], ['oid:0x1000000000009', 'SAI_PORT_ATTR_HW_LANE_LIST=1:1', 'SAI_PORT_ATTR_SPEED=25000'], ['oid:0x100000000000a', 'SAI_PORT_ATTR_HW_LANE_LIST=1:2', 'SAI_PORT_ATTR_SPEED=25000'], ['oid:0x100000000000b', 'SAI_PORT_ATTR_HW_LANE_LIST=1:3', 'SAI_PORT_ATTR_SPEED=25000'], ['oid:0x100000000000c', 'SAI_PORT_ATTR_HW_LANE_LIST=1:4', 'SAI_PORT_ATTR_SPEED=25000'], ['oid:0x100000000000d', 'SAI_PORT_ATTR_HW_LANE_LIST=1:5', 'SAI_PORT_ATTR_SPEED=25000'], ['oid:0x100000000000e', 'SAI_PORT_ATTR_HW_LANE_LIST=1:6', 'SAI_PORT_ATTR_SPEED=25000'], ['oid:0x100000000000f', 'SAI_PORT_ATTR_HW_LANE_LIST=1:7', 'SAI_PORT_ATTR_SPEED=25000'], ['oid:0x1000000000010', 'SAI_PORT_ATTR_HW_LANE_LIST=1:8', 'SAI_PORT_ATTR_SPEED=25000']]
=================================================================================== warnings summary ===================================================================================
...

>               if key.startswith("{"):
E               AttributeError: 'dict' object has no attribute 'startswith'

/usr/local/lib/python3.11/dist-packages/saichallenger/common/sai.py:625: AttributeError