gitk: Add missing accelerators

In d99b4b0de2 ("gitk: Accelerators for the main menu", 2015-09-09),
accelerators were added to allow efficient keyboard navigation. One
instance of the strings "Edit view..." and "Delete view" were left
without the ampersand.

Add the missing ampersand characters to unbreak our international
users.

Signed-off-by: Beat Bolli <dev+git@drbeat.li>
Signed-off-by: Paul Mackerras <paulus@samba.org>

gitk

@@ -12452,8 +12452,8 @@ if {$cmdline_files ne {} || $revtreeargs ne {} || $revtreeargscmd ne {}} {
     set viewchanged(1) 0
     set vdatemode(1) 0
     addviewmenu 1
-    .bar.view entryconf [mca "Edit view..."] -state normal
-    .bar.view entryconf [mca "Delete view"] -state normal
+    .bar.view entryconf [mca "&Edit view..."] -state normal
+    .bar.view entryconf [mca "&Delete view"] -state normal
 }
 
 if {[info exists permviews]} {