bake: fix entitlements check for default SSH socket

There was a mixup between fs.read and ssh entitlements check.

Corrected behavior is that if bake definition requires default
SSH forwarding then "ssh" entitlement is needed. If it requires
SSH forwarding via fixed file path then "fs.read" entitlement is
needed for that path.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

bake/entitlements.go

@@ -145,7 +145,9 @@ func (c EntitlementConf) check(bo build.Options, expected *EntitlementConf) erro
 			roPaths[p] = struct{}{}
 		}
 		if len(ssh.Paths) == 0 {
-			expected.SSH = true
+			if !c.SSH {
+				expected.SSH = true
+			}
 		}
 	}