Set z.Spec.EnableConnectionPooler=false when using dirty image

[eberlep]

Related to #282

The operator image dist with a nil reference:

time="2021-11-22T10:54:29Z" level=debug msg="closing database connection" cluster-name=153599d49eee467b-989fb2dbf8e049a99477/pgwallis-sonatypedb989fb2dbf8 pkg=cluster
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x0 pc=0x18d8fce]

goroutine 14 [running]:
github.com/zalando/postgres-operator/pkg/cluster.(*Cluster).syncConnectionPooler(0xc000273000, 0xc000a3d3b0, 0xc000d01c00, 0xc000a3d380, 0x0, 0x0, 0x0, 0x4, 0x0)
        /Users/armin/Documents/Cybertec/postgres-operator-standby-fork/pkg/cluster/connection_pooler.go:716 +0xc4e
github.com/zalando/postgres-operator/pkg/cluster.(*Cluster).Sync(0xc000273000, 0xc000d01c00, 0x0, 0x0)
        /Users/armin/Documents/Cybertec/postgres-operator-standby-fork/pkg/cluster/sync.go:142 +0x8e5
github.com/zalando/postgres-operator/pkg/controller.(*Controller).processEvent(0xc0006a4380, 0xc05efb98b0b29efe, 0x1a40d70ace5, 0x2d53360, 0xc00108a300, 0x24, 0x1de35ec, 0x4, 0x0, 0xc000d01c00, ...)
        /Users/armin/Documents/Cybertec/postgres-operator-standby-fork/pkg/controller/postgresql.go:310 +0xc45
github.com/zalando/postgres-operator/pkg/controller.(*Controller).processClusterEventsQueue(0xc0006a4380, 0x0, 0xc0000f0ea0, 0xc00020c1f0)
        /Users/armin/Documents/Cybertec/postgres-operator-standby-fork/pkg/controller/postgresql.go:344 +0x278
created by github.com/zalando/postgres-operator/pkg/controller.(*Controller).Run
        /Users/armin/Documents/Cybertec/postgres-operator-standby-fork/pkg/controller/controller.go:441 +0x8a

This is the corresponding code: https://github.com/ermajn/postgres-operator/blob/1cc716630ca9968cbfb85bc669877bc9e2e78eca/pkg/cluster/connection_pooler.go#L716

The culprit seems to be *newSpec.Spec.EnableConnectionPooler, so we probably need to set it:

z.Spec.EnableConnectionPooler = pointer.Bool(false)

This does not seem to occur in the operator we used before, but I think that one was a bit newer.