Rename core-current-stubs-system-modules to be more consistent

Renames to core-public-stubs-system-modules so that it is of the format
core-<sdk-kind>-stubs-system-modules.

Bug: 204189791
Test: m nothing
Change-Id: Iac565c940c2ef92be9cc64c0c6b8102a26afe0dd

java/core-libraries/Android.bp

@@ -86,7 +86,7 @@ java_library {
 
 // Used when compiling higher-level code against core.current.stubs.
 java_system_modules {
-    name: "core-current-stubs-system-modules",
+    name: "core-public-stubs-system-modules",
     visibility: ["//visibility:public"],
     libs: [
         "core-current-stubs-for-system-modules",