obs-filters: Fix chroma key shader bug

plugins/obs-filters/data/chroma_key_filter.effect

@@ -1,5 +1,8 @@
 uniform float4x4 ViewProj;
 uniform texture2d image;
+uniform float4x4 color_matrix;
+uniform float3 color_range_min = {0.0, 0.0, 0.0};
+uniform float3 color_range_max = {1.0, 1.0, 1.0};
 
 uniform float4x4 yuv_mat = { 0.182586,  0.614231,  0.062007, 0.062745,
                             -0.100644, -0.338572,  0.439216, 0.501961,