Error switching `standby` and `primary` metrics

[0xgouda]

Describe the bug
in the Reap() method the hostLastknownStatusInRecover[monitoredSource.Name] has been set to monitoredSource.IsInRecovery before the comparsion so it will always be false and the metrics configs won't be switched

### set to same value here
hostLastKnownStatusInRecovery[monitoredSource.Name] = monitoredSource.IsInRecovery
....
if monitoredSource.IsPostgresSource() {
    ....
    lastKnownStatusInRecovery := hostLastKnownStatusInRecovery[monitoredSource.Name]
    ... 
    ### always false we are comparing the variable to itself
    else if lastKnownStatusInRecovery != monitoredSource.IsInRecovery { 
                  ....
    }