feat: remove unnecessary section for screenshots in bug report templates

.github/ISSUE_TEMPLATE/bug_report.md

@@ -32,4 +32,3 @@ assignees: ''
 **预期结果**
 
 **相关截图**
-如果没有的话，请删除此节。

.github/ISSUE_TEMPLATE/bug_report_en.md

@@ -32,4 +32,3 @@ Please fill this in, for example: `v1.0.0`
 **Expected Result**
 
 **Related Screenshots**
-If none, please delete this section.