[gimp] app: Fix typo

[Michael Henning <mhenning src gnome org>]

commit 0ff7ab3712e5d5ae953eb3adcc871ccf6e3e6b0a
Author: Michael Henning <drawoc darkrefraction com>
Date:   Mon Aug 31 20:24:50 2015 -0400

    app: Fix typo
    
    Pointed out by prokoudine on irc after it was introduced in e2bdfd41

 app/tools/gimplevelstool.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/app/tools/gimplevelstool.c b/app/tools/gimplevelstool.c
index 3300bfb..7e6f19f 100644
--- a/app/tools/gimplevelstool.c
+++ b/app/tools/gimplevelstool.c
@@ -302,7 +302,7 @@ gimp_levels_tool_color_picker_new (GimpLevelsTool *tool,
       if (all_channels)
         help = _("Pick white point for all channels");
       else
-        help = _("Pick whitw point for the selected channel");
+        help = _("Pick white point for the selected channel");
       break;
 
     default: