cmd/run: Remove unused code

Go's encoding/json package parses all JSON numbers as float64 [1].  This
oddity was noticed when this code was first written [2], and was later
confirmed.

[1] https://pkg.go.dev/encoding/json#Unmarshal

[2] Commit cf5c58ab00
    https://github.com/containers/podman/issues/6105

https://github.com/containers/toolbox/pull/1224

src/cmd/run.go

@@ -546,8 +546,6 @@ func getEntryPointAndPID(container string) (string, int, error) {
 	switch entryPointPID := entryPointPID.(type) {
 	case float64:
 		entryPointPIDInt = int(entryPointPID)
-	case int:
-		entryPointPIDInt = entryPointPID
 	default:
 		return "", 0, fmt.Errorf("failed to inspect entry point PID of container %s", container)
 	}