when canceling download, delay removeApk() until its no longer needed

This was deleting the Apk from appMapping too fast, so the later status
updates couldn't be sent.

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

@@ -427,6 +427,7 @@ public final class AppUpdateStatusManager {
                 entry.errorText = errorText;
                 entry.intent = null;
                 notifyChange(entry, true);
+                removeApk(url);
             }
         }
     }

app/src/main/java/org/fdroid/fdroid/installer/InstallManagerService.java

@@ -176,7 +176,6 @@ public class InstallManagerService extends Service {
                 DownloaderService.cancel(this, apk.getPatchObbUrl());
                 DownloaderService.cancel(this, apk.getMainObbUrl());
             }
-            appUpdateStatusManager.removeApk(urlString);
             return START_NOT_STICKY;
         } else if (ACTION_INSTALL.equals(action)) {
             if (!isPendingInstall(urlString)) {