Re-add sponsor gtxgaming.co.uk that was mistakenly removed.

Signed-off-by: Isaac Bennetch <bennetch@gmail.com>

Author: ibennetch

pmaweb/templates/sponsors.html

@@ -119,6 +119,7 @@ <h3>Bronze sponsors</h3>
 <div class="logos">
 <a href="https://www.loadview-testing.com">Load View Testing</a>
 <a href="https://www.entertainment-nation.co.uk/">Entertainment Nation</a>
+<a href="https://www.gtxgaming.co.uk/">GTX Gaming</a>
 <a href="https://www.chefworks.com/">Chef Works Inc.</a>
 <a href="https://www.heerlaw.com">Heer Law</a>
 <a href="https://withcandour.co.uk">Candour Digital Agency</a>