Fix SSH Git Servers secret

[hilariocoelho]

Fixes #53 by removing the dash that trims the prefix.

Manifest generated using version 0.9.1:

kind: Secret
apiVersion: v1
metadata:
  name: athens-athens-proxy-ssh-git-servers
  labels:
    
    app: athens-athens-proxy
    chart: athens-proxy-0.9.1
    release: "athens"
    heritage: "Helm"
    app.kubernetes.io/name: athens-athens-proxy
    helm.sh/chart: athens-proxy-0.9.1
    app.kubernetes.io/managed-by: "Helm"
    app.kubernetes.io/instance: "athens"
    app.kubernetes.io/version: "v0.13.1"
type: Opaque
data:id_rsa-sample.server.com: "LS0tLS1CRUdJTiBPUEVOU1NIIFBSSVZBVEUgS0VZLS0tLS0KUkVEQUNURUQKLS0tLS1FTkQgT1BFTlNTSCBQUklWQVRFIEtFWS0tLS0tCg=="

Manifest generated after the fix:

kind: Secret
apiVersion: v1
metadata:
  name: athens-athens-proxy-ssh-git-servers
  labels:
    
    app: athens-athens-proxy
    chart: athens-proxy-0.9.1
    release: "athens"
    heritage: "Helm"
    app.kubernetes.io/name: athens-athens-proxy
    helm.sh/chart: athens-proxy-0.9.1
    app.kubernetes.io/managed-by: "Helm"
    app.kubernetes.io/instance: "athens"
    app.kubernetes.io/version: "v0.13.1"
type: Opaque
data:
  id_rsa-sample.server.com: "LS0tLS1CRUdJTiBPUEVOU1NIIFBSSVZBVEUgS0VZLS0tLS0KUkVEQUNURUQKLS0tLS1FTkQgT1BFTlNTSCBQUklWQVRFIEtFWS0tLS0tCg=="

[DrPsychick]

To release this, please bump the Chart.yaml version (patch)