cf/noise,vcap/testcard2: decrease noisiness

The original noisiness 30 seem to be too much to be default - with default
compression JPEG or H.264 it produces high-bitrate stream. The new value
200 may better approximate real-life complexity video.

src/capture_filter/noise.c

@@ -58,7 +58,7 @@ struct module;
 static void done(void *state);
 
 enum {
-        DEFAULT_MAGNITUDE = 30,
+        DEFAULT_MAGNITUDE = 200,
 };
 
 struct state_noise {

src/video_capture/testcard2.c

@@ -94,7 +94,7 @@ enum {
         BANNER_MARGIN_BOTTOM = 75,
         BUFFER_SEC           = 1,
         FONT_HEIGHT          = 108,
-        NOISE_DEFAULT        = 30,
+        NOISE_DEFAULT        = 200,
 };
 
 #define DEFAULT_FORMAT \