Bug#805382: profile.d script: abundant = in `[`-expression (potential bashism)

[chrysn]

Package: debian-mate-default-settings
Version: 1.10.2-4
Severity: normal
File: /etc/profile.d/debian-mate-default-settings_gtk-accessibility.sh

The abovementioned file, when sourced by dash or zsh, produces error
messages due to the use of `==` in a test-expression (`[`):

> $ dash -l
> dash: 17: [: x: unexpected operator

zsh does not by default source /etc/profile, but if it is made to do
explicitly:

> % . /etc/profile
> /etc/profile.d/debian-mate-default-settings_gtk-accessibility.sh:17: = not found

just replacing the `==` with `=` should make the script posix-shell
compatible.

-- System Information:
Debian Release: stretch/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.2.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages debian-mate-default-settings depends on:
ii  desktop-file-utils  0.22-1

debian-mate-default-settings recommends no packages.

Versions of packages debian-mate-default-settings suggests:
ii  mate-desktop-environment-core  1.10.0+1

-- no debconf information
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