ts: eliminate -Warray-bounds warning

modules/ts/src/ts_func.cpp

@@ -2703,7 +2703,7 @@ static void calcSobelKernel1D( int order, int _aperture_size, int size, vector<i
 
     if( _aperture_size < 0 )
     {
-        static const int scharr[] = { 3, 10, 3, -1, 0, 1 };
+        static const int scharr[8] = { 3, 10, 3, -1, 0, 1, 0, 0 };  // extra elements to eliminate "-Warray-bounds" bogus warning
         assert( size == 3 );
         for( i = 0; i < size; i++ )
             kernel[i] = scharr[order*3 + i];