[gthumb] help: Remove id parameter which is not supported by <table> tags

[Andre Klapper <aklapper src gnome org>]

commit d9918bbcfc230f3202cddedd91141d37151310eb
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Sep 17 15:11:58 2017 +0200

    help: Remove id parameter which is not supported by <table> tags

 help/C/strftime.page |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/help/C/strftime.page b/help/C/strftime.page
index b7dfc79..606a2c3 100644
--- a/help/C/strftime.page
+++ b/help/C/strftime.page
@@ -10,7 +10,7 @@ id="gthumb-date-formats">
   <p>This is a summary of standard date/time codes that may be used
   in format strings:</p>
 
-  <table id="gthumb-TBL-strftime">
+  <table>
     <title>Valid format codes for custom subfolders</title>
     <tr>
       <td>