Fix disabled fields in repo settings UI (#1431)

templates/repo/settings/options.tmpl

@@ -93,14 +93,15 @@
 				{{.CsrfTokenHtml}}
 				<input type="hidden" name="action" value="advanced">
 
+				{{$isWikiEnabled := or (.Repository.EnableUnit $.UnitTypeWiki) (.Repository.EnableUnit $.UnitTypeExternalWiki)}}
 				<div class="inline field">
 					<label>{{.i18n.Tr "repo.wiki"}}</label>
 					<div class="ui checkbox">
-						<input class="enable-system" name="enable_wiki" type="checkbox" data-target="#wiki_box" {{if or (.Repository.EnableUnit $.UnitTypeWiki) (.Repository.EnableUnit $.UnitTypeExternalWiki)}}checked{{end}}>
+						<input class="enable-system" name="enable_wiki" type="checkbox" data-target="#wiki_box" {{if $isWikiEnabled}}checked{{end}}>
 						<label>{{.i18n.Tr "repo.settings.wiki_desc"}}</label>
 					</div>
 				</div>
-				<div class="field {{if not (.Repository.EnableUnit $.UnitTypeWiki)}}disabled{{end}}" id="wiki_box">
+				<div class="field {{if not $isWikiEnabled}}disabled{{end}}" id="wiki_box">
 					<div class="field">
 						<div class="ui radio checkbox">
 							<input class="hidden enable-system-radio" tabindex="0" name="enable_external_wiki" type="radio" value="false" data-target="#external_wiki_box" {{if not (.Repository.EnableUnit $.UnitTypeExternalWiki)}}checked{{end}}/>
@@ -122,14 +123,15 @@
 
 				<div class="ui divider"></div>
 
+				{{$isIssuesEnabled := or (.Repository.EnableUnit $.UnitTypeIssues) (.Repository.EnableUnit $.UnitTypeExternalTracker)}}
 				<div class="inline field">
 					<label>{{.i18n.Tr "repo.issues"}}</label>
 					<div class="ui checkbox">
-						<input class="enable-system" name="enable_issues" type="checkbox" data-target="#issue_box" {{if or (.Repository.EnableUnit $.UnitTypeIssues) (.Repository.EnableUnit $.UnitTypeExternalTracker)}}checked{{end}}>
+						<input class="enable-system" name="enable_issues" type="checkbox" data-target="#issue_box" {{if $isIssuesEnabled}}checked{{end}}>
 						<label>{{.i18n.Tr "repo.settings.issues_desc"}}</label>
 					</div>
 				</div>
-				<div class="field {{if not (.Repository.EnableUnit $.UnitTypeIssues)}}disabled{{end}}" id="issue_box">
+				<div class="field {{if not $isIssuesEnabled}}disabled{{end}}" id="issue_box">
 					<div class="field">
 						<div class="ui radio checkbox">
 							<input class="hidden enable-system-radio" tabindex="0" name="enable_external_tracker" type="radio" value="false" data-target="#external_issue_box" {{if not (.Repository.EnableUnit $.UnitTypeExternalTracker)}}checked{{end}}/>