swscale/utils: override forced-zero formats back to full range

Fixes vf_scale outputting RGB AVFrames with limited range flagged
in case either input or output specifically sets the range.

This is the reverse of the logic utilized for RGB and PAL8 content
in sws_setColorspaceDetails.

libswscale/utils.c

@@ -1013,8 +1013,8 @@ int sws_getColorspaceDetails(struct SwsContext *c, int **inv_table,
 
     *inv_table  = c->srcColorspaceTable;
     *table      = c->dstColorspaceTable;
-    *srcRange   = c->srcRange;
-    *dstRange   = c->dstRange;
+    *srcRange   = range_override_needed(c->srcFormat) ? 1 : c->srcRange;
+    *dstRange   = range_override_needed(c->dstFormat) ? 1 : c->dstRange;
     *brightness = c->brightness;
     *contrast   = c->contrast;
     *saturation = c->saturation;