Fix license file name in all/build.gradle.kts

Signed-off-by: Graham <gpe@openrs2.dev>

all/build.gradle.kts

@@ -46,7 +46,7 @@ configure(tasks.filter { it.name in distTasks }) {
 distributions {
     all {
         contents {
-            from("${rootProject.projectDir}/COPYING")
+            from("${rootProject.projectDir}/LICENSE")
             from("${rootProject.projectDir}/README.md")
             from("${rootProject.projectDir}/docs") {
                 include("*.md")