Free bot client if cannot load bot

Introduced by commit a57a5cfd9b5dcc51696777c67b275c55c5b4b452.
#5979: Cubemap support for opengl2.
OpenGL2: Use RGBM instead of RGBE encoding for lightmaps.
OpenGL2: Fix inaccurate RGBM calculation.
OpenGL2: Speed up fog shader slightly.
OpenGL2: Some shader cleanup
OpenGL2: Fix for "unsupported framebuffer format" bug
OpenGL2: reduce varying usage in lightall shader.
Fix UI parse message for menu files

Missing a space after colon.
OpenGL2: Disable GL_ARB_seamless_cube_map by default, caused huge frame drops on some hardware
Merge remote-tracking branch 'ioquake3/master'

Conflicts:
	code/game/g_bot.c
	code/renderergl2/tr_backend.c
	code/renderergl2/tr_bsp.c
	code/renderergl2/tr_local.h
	code/renderergl2/tr_main.c
	code/renderergl2/tr_scene.c
	code/renderergl2/tr_world.c
	code/ui/ui_main.c