Revert length of 'mosaic_name' in make_solo_mosaic.c

to be STRING characters long.

Fixes ufs-community#823

sorc/fre-nctools.fd/tools/make_solo_mosaic/make_solo_mosaic.c

@@ -81,7 +81,7 @@ int main (int argc, char *argv[])
   int contact_tile1_jstart[MAXCONTACT], contact_tile1_jend[MAXCONTACT];
   int contact_tile2_istart[MAXCONTACT], contact_tile2_iend[MAXCONTACT];
   int contact_tile2_jstart[MAXCONTACT], contact_tile2_jend[MAXCONTACT];
-  char mosaic_name[128] = "solo_mosaic";
+  char mosaic_name[STRING] = "solo_mosaic";
   char grid_descriptor[128] = "";
   int c, i, n, m, l, errflg;