shquote.c incorrectly escapes comma, but not tilde

[scragar]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS:  -DPROGRAM='bash' -DCONF_HOSTTYPE='x86_64' 
-DCONF_OSTYPE='linux-gnu' -DCONF_MACHTYPE='x86_64-pc-linux-gnu' 
-DCONF_VENDOR='pc' -DLOCALEDIR='/usr/share/locale' -DPACKAGE='bash' -DSHELL 
-DHAVE_CONFIG_H   -I.  -I../. -I.././include -I.././lib  -Wdate-time 
-D_FORTIFY_SOURCE=2 -g -O2 -fstack-protector-strong -Wformat 
-Werror=format-security -Wall
uname output: Linux dnwks49 4.4.0-72-generic #93-Ubuntu SMP Fri Mar 31 14:07:41 
UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 4.3
Patch Level: 46
Release Status: release

Description:
        When using any functionality that triggers shquote the
        comma character is escaped with a backslash which bash
        doesn't strip when the quoted text is reused, while
        tilde isn't despite it causing home directory expansion.

Repeat-By:
        Run
                echo $(printf "%q" "~" "a,b")
        Expected output:
                ~ a,b
        Given output
                /home/scragar a\,b

Fix:
        patching /lib/sh/shquote.c to have the bstab to have zero
        for comma and a 1 for the tilde fixes this issue locally