SNMP Interface Templates have bad default macro {$IF_ERRORS_WARN}

Steps to reproduce:

• Use the Template "Template Module Interfaces Simple SNMPv2"
• Have the Trigger "Network Interfaces Discovery: Interface wifi0: High error rate" triggered
• Resolve Trigger source (Error rate = 0)

Result:

• Trigger will not resolve

Expected:

• Trigger should resolve

Analysis:
{$IF_ERRORS_WARN} is set to 2, which results in the resolve expression "errors<0" which never happens