video/out/gpu/video: make the target-contrast limit higher

OLEDs report min luminance of 0.0002 nits, while we couldn't set this
with options due to limit. Set limit, so that we cannot exceed the hdr
black value used in libplacebo in worst case scenario of target peak 10
nits.

Author: kasper93

video/out/gpu/video.c

@@ -446,7 +446,7 @@ const struct m_sub_options gl_video_conf = {
         {"hdr-reference-white", OPT_CHOICE(hdr_reference_white, {"auto", 0}),
             M_RANGE(10, 10000)},
         {"target-contrast", OPT_CHOICE(target_contrast, {"auto", 0}, {"inf", -1}),
-            M_RANGE(10, 1000000)},
+            M_RANGE(10, 10 / PL_COLOR_HDR_BLACK)},
         {"target-gamut", OPT_CHOICE_C(target_gamut, pl_csp_prim_names)},
         {"tone-mapping", OPT_CHOICE(tone_map.curve,
             {"auto",     TONE_MAPPING_AUTO},