Add gl_sync to MangoHud.conf
### VSYNC [0-3] 0 = adaptive; 1 = off; 2 = mailbox; 3 = on
# vsync=
+### OpenGL VSYNC [0-N] 0 = off; >=1 = wait for N v-blanks, N > 1 acts as a fps limiter (fps = display refresh rate / N)
+# gl_vsync=
+
################### VISUAL ###################
### Display the current CPU information
