Eevee: Film filter default to 1.5 instead of 1.0

Cycles already uses 1.5 as default. BI original 1.0 filter doesn't look good for
Eevee. The ideal scenario would be for both Cycles AND Eevee to use the same DNA
setting.

But for now it is nice to at least have Eevee renders to look better by default.

Note: This handles doversion for 2.7x files only. Files previously created in
2.8 need to be manually corrected.

source/blender/blenkernel/intern/scene.c

@@ -618,7 +618,7 @@ void BKE_scene_init(Scene *sce)
 	 */
 	sce->r.color_mgt_flag |= R_COLOR_MANAGEMENT;
 
-	sce->r.gauss = 1.0;
+	sce->r.gauss = 1.5f;
 	
 	/* deprecated but keep for upwards compat */
 	sce->r.postgamma = 1.0;

source/blender/blenloader/intern/versioning_280.c

@@ -701,6 +701,10 @@ void blo_do_versions_280(FileData *fd, Library *UNUSED(lib), Main *main)
 				}
 			}
 		}
+
+		for (Scene *scene = main->scene.first; scene; scene = scene->id.next) {
+			scene->r.gauss = 1.5f;
+		}
 	}
 
 	if (!MAIN_VERSION_ATLEAST(main, 280, 1)) {