prisma-engine_7: fix meta.mainProgram

the attribute meta.mainProgram was set to `prisma`, while the derivation
only builds a single binary `schema-engine`

pkgs/by-name/pr/prisma-engines_7/package.nix

@@ -54,7 +54,7 @@ rustPlatform.buildRustPackage (finalAttrs: {
     homepage = "https://www.prisma.io/";
     license = lib.licenses.asl20;
     platforms = lib.platforms.unix;
-    mainProgram = "prisma";
+    mainProgram = "schema-engine";
     maintainers = with lib.maintainers; [
       aqrln
     ];