Adapt to exception rename in Gerrit core

Change Icd60fa14a in Gerrit core renamed SubmoduleException to
SubmoduleConflictException.

Signed-off-by: Edwin Kempin <ekempin@google.com>
Change-Id: I33eec69e435be13bdc9509ead1cca98de54a294e
diff --git a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeletePreconditions.java b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeletePreconditions.java
index 05842c4..417c968 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeletePreconditions.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/deleteproject/DeletePreconditions.java
@@ -39,7 +39,7 @@
 import com.google.gerrit.server.query.change.InternalChangeQuery;
 import com.google.gerrit.server.restapi.project.ListChildProjects;
 import com.google.gerrit.server.submit.MergeOpRepoManager;
-import com.google.gerrit.server.submit.SubmoduleException;
+import com.google.gerrit.server.submit.SubmoduleConflictException;
 import com.google.gerrit.server.submit.SubmoduleOp;
 import com.google.inject.Inject;
 import com.google.inject.Provider;
@@ -165,7 +165,7 @@
     } catch (RepositoryNotFoundException e) {
       // we're trying to delete the repository,
       // so this exception should not stop us
-    } catch (IOException | SubmoduleException e) {
+    } catch (IOException | SubmoduleConflictException e) {
       throw new CannotDeleteProjectException("Project is subscribed by other projects.", e);
     }
   }