enb-cells_2ca: add missing cell params

the default params are set for a single cell in defaults.conf
but this 2 cell config requires them to be set explicitly.

Change-Id: I8b3c486eb3e42aeb04b6a7548d3f0de2aa40ee0c

sysmocom/scenarios/mod-enb-cells-2ca.conf

@@ -6,6 +6,8 @@ modifiers:
     - cell_id: 0x00
       pci: 0x01
       dl_earfcn: 2850
+      tac: 0x0007
+      root_seq_idx: 204
       rf_port: 0
       scell_list: [0x01]
       ncell_list:
@@ -16,6 +18,8 @@ modifiers:
     - cell_id: 0x01
       pci: 0x02
       dl_earfcn: 3050
+      tac: 0x0007
+      root_seq_idx: 205
       rf_port: 1
       scell_list: [0x00]
       ncell_list: