Changed the id in resource processing to be lowercase (#3329)

build-logic/src/main/kotlin/geyser.base-conventions.gradle.kts

@@ -11,7 +11,7 @@ tasks {
     processResources {
         filesMatching(listOf("plugin.yml", "bungee.yml", "velocity-plugin.json", "META-INF/sponge_plugins.json")) {
             expand(
-                "id" to "Geyser",
+                "id" to "geyser",
                 "name" to "Geyser",
                 "version" to project.version,
                 "description" to project.description,
@@ -30,4 +30,4 @@ java {
     targetCompatibility = JavaVersion.VERSION_16
 
     withSourcesJar()
-}
+}