mac-capture: Use obs_get_default_rect_effect

plugins/mac-capture/data/draw_rect.effect

@@ -1,35 +0,0 @@
-uniform float4x4 ViewProj;
-uniform texture_rect diffuse;
-
-sampler_state texSampler {
-	AddressU  = Clamp;
-	AddressV  = Clamp;
-	Filter    = Linear;
-};
-
-struct VertexInOut {
-	float4 pos : POSITION;
-	float2 uv  : TEXCOORD0;
-};
-
-VertexInOut VShader(VertexInOut vert_in)
-{
-	VertexInOut vert_out;
-	vert_out.pos = mul(float4(vert_in.pos.xyz, 1.0), ViewProj);
-	vert_out.uv = vert_in.uv;
-	return vert_out;
-}
-
-float4 PShader(VertexInOut fragment_in) : TARGET
-{
-	return diffuse.Sample(texSampler, fragment_in.uv);
-}
-
-technique Default
-{
-	pass
-	{
-		vertex_shader = VShader(vert_in);
-		pixel_shader  = PShader(fragment_in);
-	}
-}