grafana: fix find(1) brackets in go.mod fixup

DAMN you `find`!

The parentheses are only necessary when having `-exec` 🫠
It does what I expected, i.e. finding EVERY go.mod and go.work instead
of only go.work when not using `-exec`.

pkgs/servers/monitoring/grafana/default.nix

@@ -64,7 +64,7 @@ buildGoModule (finalAttrs: {
   # This is still better than maintaining some list of go.mod files (or exclusions of that)
   # where to patch the go version (and where to not do that).
   postPatch = ''
-    find . -name go.mod -or -name "go.work" -type f -exec sed -i -e 's/^go .*/go ${finalAttrs.passthru.go.version}/g' {} \;
+    find . \( -name go.mod -or -name "go.work" \) -type f -exec sed -i -e 's/^go .*/go ${finalAttrs.passthru.go.version}/g' {} \;
   '';
 
   proxyVendor = true;