gitk: Remove tcl-format flag from a message that shouldn't have it

xgettext sees "% o" and interprets it as a placeholder for an octal
number preceded by a space. However, in this case it's not actually a
placeholder, and most translations will replace the "% o" sequence with
something else. Removing the tcl-format flag from this string prevents
tools like Poedit from freaking out when "% o" doesn't appear in the
translated string.

The corrected flag will appear in each translation's po file the next time
the translation is updated with `make update-po`.
Signed-off-by: NAlex Henrie <alexhenrie24@gmail.com>
Signed-off-by: NPaul Mackerras <paulus@samba.org>

gitk

@@ -11330,6 +11330,7 @@ proc prefspage_general {notebook} {
     ${NS}::label $page.maxwidthl -text [mc "Maximum graph width (lines)"]
     spinbox $page.maxwidth -from 0 -to 100 -width 4 -textvariable maxwidth
     grid $page.spacer $page.maxwidthl $page.maxwidth -sticky w
+                                         #xgettext:no-tcl-format
     ${NS}::label $page.maxpctl -text [mc "Maximum graph width (% of pane)"]
     spinbox $page.maxpct -from 1 -to 100 -width 4 -textvariable maxgraphpct
     grid x $page.maxpctl $page.maxpct -sticky w