fix edge case where resetting shader parameter wasn't counted as a modification

menu/menu_shader.c

@@ -446,6 +446,8 @@ int menu_shader_manager_clear_parameter(struct video_shader *shader,
    param->current = MIN(MAX(param->minimum,
             param->current), param->maximum);
 
+   menu_driver_shader_modified = true;
+
    return 0;
 }
 

ui/drivers/qt/shaderparamsdialog.cpp

@@ -558,6 +558,8 @@ void ShaderParamsDialog::onShaderResetPass(int pass)
       }
    }
 
+   menu_shader_set_modified(true);
+
    reload();
 }
 
@@ -602,6 +604,8 @@ void ShaderParamsDialog::onShaderResetParameter(QString parameter)
          param->current = param->initial;
    }
 
+   menu_shader_set_modified(true);
+
    reload();
 }