headlamp and cloud-spanner have incorrect file permissions

[spowelljr]

Related #16408

After my fix in #16408 that fixes setting file permissions, the headlamp and cloud-spanner addons failed to enable.

I0501 18:55:15.820857  777919 out.go:177]     ▪ Using image ghcr.io/headlamp-k8s/headlamp:v0.16.0
    ▪ Using image ghcr.io/headlamp-k8s/headlamp:v0.16.0
I0501 18:55:15.822465  777919 addons.go:420] installing /etc/kubernetes/addons/headlamp-namespace.yaml
I0501 18:55:15.822495  777919 exec_runner.go:151] cp: memory --> /etc/kubernetes/addons/headlamp-namespace.yaml (76 bytes)
I0501 18:55:15.824305  777919 out.go:177] 

W0501 18:55:15.825713  777919 out.go:239] ❌  Exiting due to MK_ADDON_ENABLE: enable failed: run callbacks: running callbacks: [error writing to tempfile /tmp/minikube3721412578: create: open /tmp/minikube3721412578: permission denied]
❌  Exiting due to MK_ADDON_ENABLE: enable failed: run callbacks: running callbacks: [error writing to tempfile /tmp/minikube3721412578: create: open /tmp/minikube3721412578: permission denied]
W0501 18:55:15.825730  777919 out.go:239] 

W0501 18:55:15.827107  777919 out.go:239] ╭───────────────────────────────────────────────────────────────────────────────────────────╮
│                                                                                           │
│    😿  If the above advice does not help, please let us know:                             │
│    👉  https://github.com/kubernetes/minikube/issues/new/choose                           │
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│    Please run `minikube logs --file=logs.txt` and attach logs.txt to the GitHub issue.    │
│    Please also attach the following file to the GitHub issue:                             │
│    - /tmp/minikube_addons_af3b8a9ce4f102efc219f1404c9eed7a69cbf2d5_0.log                  │
│                                                                                           │
╰───────────────────────────────────────────────────────────────────────────────────────────╯

I looked at the file permissions for those addon files and they have a typo, they're 6040 instead of 0640.