Fix russian dict to accomadate new cost computations

The pull req opencog#1456 broke the existing russian dict.
This fixes it.  Seems that a cost cutoff of 3.1 is too low,
as it rejects many good linkages that come from
[[FOO]] & [[BAR]] disjuncts. a cutoff of 4.1 allows these,
while rejecting the cost-6 linkages that ruin corpus-basic.

As of now, I get 45 errors in ru/corpus-basic.batch which is
two less than the 47 that I got, before merging opencog#1450

data/ru/4.0.dict

@@ -7,10 +7,10 @@
 %%
 %% This file uses the utf8 encoding
 
-#define dictionary-version-number 5.11.0;
+#define dictionary-version-number 5.12.1;
 #define dictionary-locale         ru_RU.UTF-8;
-#define max-disjunct-cost         2.7;
-#define panic-max-disjunct-cost   4.0;
+#define max-disjunct-cost         4.1;
+#define panic-max-disjunct-cost   4.1;
 
 <costly-null>: [[[[]]]];