[shotwell] Remove one use of time_t

[Jens Georg <jensgeorg src gnome org>]

commit 0051a274f48755d5939ac9d80effafdf456c278b
Author: Jens Georg <mail jensge org>
Date:   Mon Feb 10 21:50:55 2020 +0100

    Remove one use of time_t

 src/Debug.vala | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
---
diff --git a/src/Debug.vala b/src/Debug.vala
index f159b0d6..a4104232 100644
--- a/src/Debug.vala
+++ b/src/Debug.vala
@@ -104,11 +104,10 @@ namespace Debug {
     }
     
     private void log(FileStream stream, string prefix, string message) {
-        time_t now = time_t();
         stream.printf("%s %d %s [%s] %s\n",
             log_app_version_prefix,
             Posix.getpid(),
-            Time.local(now).to_string(),
+            new DateTime.now_local().format("%F %T"),
             prefix,
             message
         );