fix(docs): fix yaml issue in template

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -1,5 +1,5 @@
 ---
-name: 🐛 Bug report: Nextcloud iOS Client
+name: 🐛 Bug report
 about: Submit a report and help us improve the Nextcloud iOS Client
 labels: bug, 0. Needs triage
 ---