Refactor repo commit list (#23690)

### Before

* The check of `if PullRequest.BaseRepo.Name` doesn't make sense,
because the `$commitLink` is always constructed below
* Many `if` blocks make the HTML tags (likely) not match in IDE.
Although the rendered result matches, it's very unfriendly to editors or
code analyzer, and it's difficult to read.


### After

Move the `$commitLink` assignment ahead.

Simplify the code, resolve the above problems.

Author: wxiaoguang

templates/repo/commits_list_small.tmpl

@@ -13,6 +13,8 @@
 			{{avatarByEmail $.root.Context .Author.Email .Author.Name}}
 		{{end}}
 
+		{{$commitLink:= printf "%s/commit/%s" $.comment.Issue.PullRequest.BaseRepo.Link (PathEscape .ID.String)}}
+
 		<span class="ui float right shabox">
 			{{template "repo/commit_statuses" dict "Status" .Status "Statuses" .Statuses "root" $.root}}
 			{{$class := "ui sha label"}}
@@ -30,23 +32,14 @@
 					{{$class = (printf "%s%s" $class " isWarning")}}
 				{{end}}
 			{{end}}
-			{{if $.comment.Issue.PullRequest.BaseRepo.Name}}
-				<a href="{{$.comment.Issue.PullRequest.BaseRepo.Link}}/commit/{{PathEscape .ID.String}}" rel="nofollow" class="{{$class}}">
-			{{else}}
-				<span class="{{$class}}">
-			{{end}}
-			<span class="shortsha">{{ShortSha .ID.String}}</span>
-			{{if .Signature}}
-				{{template "repo/shabox_badge" dict "root" $.root "verification" .Verification}}
-			{{end}}
-			{{if $.comment.Issue.PullRequest.BaseRepo.Name}}
-				</a>
-			{{else}}
-				</span>
-			{{end}}
+			<a href="{{$commitLink}}" rel="nofollow" class="{{$class}}">
+				<span class="shortsha">{{ShortSha .ID.String}}</span>
+				{{if .Signature}}
+					{{template "repo/shabox_badge" dict "root" $.root "verification" .Verification}}
+				{{end}}
+			</a>
 		</span>
 
-		{{$commitLink:= printf "%s/commit/%s" $.comment.Issue.PullRequest.BaseRepo.Link (PathEscape .ID.String)}}
 		<span class="gt-mono commit-summary {{if gt .ParentCount 1}} grey text{{end}}" title="{{.Summary}}">{{RenderCommitMessageLinkSubject $.root.Context .Message ($.comment.Issue.PullRequest.BaseRepo.Link|Escape) $commitLink $.comment.Issue.PullRequest.BaseRepo.ComposeMetas}}</span>
 		{{if IsMultilineCommitMessage .Message}}
 			<button class="ui button ellipsis-button" aria-expanded="false">...</button>