filter/shader: Initialize with given data

Ignoring the data parameter during initialization results in duplication and some third party plugins not working as expected, so it's better to not ignore it.

Fixes #315

source/filters/filter-shader.cpp

@@ -30,6 +30,8 @@ shader_instance::shader_instance(obs_data_t* data, obs_source_t* self) : obs::so
 {
 	_fx = std::make_shared<gfx::shader::shader>(self, gfx::shader::shader_mode::Filter);
 	_rt = std::make_shared<gs::rendertarget>(GS_RGBA, GS_ZS_NONE);
+
+	update(data);
 }
 
 shader_instance::~shader_instance() {}