Revert "config: prefixes image names with ko:// scheme"

This reverts commit c903e5d.

Author: afrittoli

config/controller.yaml

@@ -42,7 +42,7 @@ spec:
       serviceAccountName: tekton-pipelines-controller
       containers:
       - name: tekton-pipelines-controller
-        image: ko://github.com/tektoncd/pipeline/cmd/controller
+        image: github.com/tektoncd/pipeline/cmd/controller
         args: [
           # These images are built on-demand by `ko resolve` and are replaced
           # by image references by digest.

config/webhook.yaml

@@ -48,7 +48,7 @@ spec:
       - name: webhook
         # This is the Go import path for the binary that is containerized
         # and substituted here.
-        image: ko://github.com/tektoncd/pipeline/cmd/webhook
+        image: github.com/tektoncd/pipeline/cmd/webhook
         env:
         - name: SYSTEM_NAMESPACE
           valueFrom: