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contrast: process channels separately

Remove the SOX_EFF_MCHAN flag for the contrast effect. Processing all
channels at once isn't necessary for contrast (even though it is more
efficient) and more prone to bugs.

--- a/src/contrast.c

+++ b/src/contrast.c

@@ -44,6 +44,6 @@

 sox_effect_handler_t const * lsx_contrast_effect_fn(void)

 {

   static sox_effect_handler_t handler = {"contrast", "[enhancement (75)]",

-    SOX_EFF_MCHAN, create, NULL, flow, NULL, NULL, NULL, sizeof(priv_t)};

+    0, create, NULL, flow, NULL, NULL, NULL, sizeof(priv_t)};

   return &handler;

 }