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Strengthened film grain setting.

This patch increases the preference for maintaining similar variance
between source and reconstruction and thus helps improve film grain
retention.

The changes are only active when film mode is selected

Change-Id: I3bc082dca678a0f32ec00f30f5d90d0f95ca2381

--- a/vp9/encoder/vp9_rdopt.c

+++ b/vp9/encoder/vp9_rdopt.c

@@ -2999,8 +2999,8 @@

 // on the relative variance of the source and reconstruction.

 #define VERY_LOW_VAR_THRESH 2

 #define LOW_VAR_THRESH 5

-#define VAR_MULT 100

-static unsigned int max_var_adjust[VP9E_CONTENT_INVALID] = { 16, 16, 100 };

+#define VAR_MULT 250

+static unsigned int max_var_adjust[VP9E_CONTENT_INVALID] = { 16, 16, 250 };

 static void rd_variance_adjustment(VP9_COMP *cpi, MACROBLOCK *x,

                                    BLOCK_SIZE bsize, int64_t *this_rd,