Make ZLS runner target explicit in workspace BUILD files and update the zls.sh script accordingly.

BUILD.bazel

@@ -1,4 +1,10 @@
 load("@rules_zig//zig:defs.bzl", "zls_completion")
+load("@zml//third_party/zls:zls.bzl", "zls_runner")
+
+zls_runner(
+    name = "zls",
+    target = ":completion",
+)
 
 zls_completion(
     name = "completion",

third_party/zls/BUILD.bazel

@@ -1,10 +1,5 @@
-load(":zls.bzl", "targets", "zls_runner")
+load(":zls.bzl", "targets")
 
 toolchain_type(name = "toolchain_type")
 
 targets()
-
-zls_runner(
-    name = "zls",
-    target = "//:completion",
-)

tools/zls.sh

@@ -1,4 +1,4 @@
 #!/bin/bash
 cd "$(dirname "${BASH_SOURCE[0]}")"
 cd "$(bazel info workspace)"
-exec bazel run -- @zml//third_party/zls:zls "${@}"
+exec bazel run -- @zml//:zls "${@}"