Removed invalid form tag (#14391)

introduced by #5073

templates/repo/issue/view_content/sidebar.tmpl

@@ -527,18 +527,15 @@
 			{{ if and .IsRepoAdmin (not .Repository.IsArchived) }}
 			<div class="ui divider"></div>
 			<div class="ui watching">
-				<div>
-					<button class="fluid ui show-modal button {{if .Issue.IsLocked }} negative {{ end }}" data-modal="#lock">
-							{{if .Issue.IsLocked}}
-								{{svg "octicon-key"}}
-								{{.i18n.Tr "repo.issues.unlock"}}
-							{{else}}
-								{{svg "octicon-lock"}}
-								{{.i18n.Tr "repo.issues.lock"}}
-							{{end}}
-						</button>
-					</form>
-				</div>
+				<button class="fluid ui show-modal button {{if .Issue.IsLocked }} negative {{ end }}" data-modal="#lock">
+					{{if .Issue.IsLocked}}
+						{{svg "octicon-key"}}
+						{{.i18n.Tr "repo.issues.unlock"}}
+					{{else}}
+						{{svg "octicon-lock"}}
+						{{.i18n.Tr "repo.issues.lock"}}
+					{{end}}
+				</button>
 			</div>