fix: Typo in IBM icon definition (#5395)

includes/definitions/ibm-amm.yaml

@@ -1,7 +1,7 @@
 os: ibm-amm
 text: 'IBM AMM'
 type: appliance
-icon: ibmnos
+icon: ibmos
 mib_dir:
     - ibm
 discovery:

includes/definitions/ibm-imm.yaml

@@ -1,7 +1,7 @@
 os: ibm-imm
 text: 'IBM IMM'
 type: appliance
-icon: ibmnos
+icon: ibmos
 over:
     - { graph: device_bits, text: Traffic }
     - { graph: device_processor, text: 'CPU Usage' }

includes/definitions/ibmnos.yaml

@@ -1,7 +1,7 @@
 os: ibmnos
 text: 'IBM Networking Operating System'
 type: network
-icon: ibmnos
+icon: ibmos
 over:
     - { graph: device_bits, text: Traffic }
 discovery: