Fix regex in KMP for visiting inner classes

Summary: The old regex was accepting all inner classes per each inner class instead of just the next inner class in the hierarchy, therefore the analysis was blowing up and visiting classes an unnesessarily huge amount of times.

Author: olesya.subbotina

kmp-library/src/main/java/com/guardsquare/proguard/kotlin/printer/KotlinMetadataPrinter.java

@@ -1080,7 +1080,7 @@ private void visitChildClasses(Clazz clazz)
             // Cache the synthetic class string, as we might have already visited them, so the string will be empty.
             pushStringBuilder();
             programClassPool.classesAccept(
-                    clazz.getName() + TypeConstants.INNER_CLASS_SEPARATOR + "*",
+                    clazz.getName() + TypeConstants.INNER_CLASS_SEPARATOR + "[^$]+",
                     new ReferencedKotlinMetadataVisitor(MyKotlinSourceMetadataPrinter.this));
             String innerClassesString = popStringBuilder();
             if (innerClassesString.length() > 0)