ApplicationID / PackageName is defined as case-sensitive

* fdroidserver uses case-sensitive naming since it is based on GNU/Linux
  filesystems, which are case-sensitive by default.

* "the application ID looks like a traditional Java package name, the naming
   rules for the application ID are a bit more restrictive"
   https://developer.android.com/studio/build/application-id

* Java is a case-sensitive language for all names used in .java files:
  "In the Java programming universe, case-sensitive String keys are ubiquitous"
  "Java package names... are case-sensitive"
  https://docs.oracle.com/javase/8/docs/technotes/guides/preferences/designfaq.html

app/src/main/java/org/fdroid/fdroid/AppUpdateStatusManager.java

@@ -245,7 +245,7 @@ public final class AppUpdateStatusManager {
         ArrayList<AppUpdateStatus> returnValues = new ArrayList<>();
         synchronized (appMapping) {
             for (AppUpdateStatus entry : appMapping.values()) {
-                if (entry.apk.packageName.equalsIgnoreCase(packageName)) {
+                if (entry.apk.packageName.equals(packageName)) {
                     returnValues.add(entry);
                 }
             }