Indent items in perm_invent window

Add a space in front of items in the perm_invent window as in the inventory
window.

doc/fixes37.0

@@ -433,6 +433,7 @@ statues representing petrified creatures on Medusa's level might be from
 attempt to make corpse or statue of a named player character would yield that
 	of a random monster instead when 'record' was empty; could result in
 	statues of non-stonable creatures in cockatrice nests
+indent items in perm_invent window
 
 
 Fixes to 3.7.0-x Problems that Were Exposed Via git Repository

win/curses/cursinvt.c

@@ -362,8 +362,9 @@ curs_show_invt(WINDOW *win)
             /* despite being shown as a menu, nothing is selectable from the
                persistent inventory window so avoid the usual highlighting
                of inventory letters */
-            wprintw(win, "%c) ", accelerator);
-            available_width -= 3; /* letter+parenthesis+space */
+            wprintw(win, " %c) ", accelerator);
+            available_width -= 4; /* space+letter+parenthesis+space */
+
             /*
              * Narrow the entries to fit more of the interesting text,
              * but defer the removal until after menu colors matching.