Fix dashboard repolist alignment and repolisting (#17355)

Unfortunately #17301 broke the restriction of the dashboard repolist to
the user's repos because it stopped passing in the uid for the current
user. This PR restores this.

There is also a weird alignment problem - not caused by that PR - where
the menu items in the repolist spread over multiple lines. This PR
simply reduces the padding on these items and switches the justification
of the flex elements to space-evenly.

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: techknowlogick <techknowlogick@gitea.io>

routers/web/user/home.go

@@ -72,8 +72,14 @@ func Dashboard(ctx *context.Context) {
 	ctx.Data["PageIsDashboard"] = true
 	ctx.Data["PageIsNews"] = true
 
+	var uid int64
+	if ctxUser != nil {
+		uid = ctxUser.ID
+	}
+
 	ctx.PageData["dashboardRepoList"] = map[string]interface{}{
 		"searchLimit": setting.UI.User.RepoPagingNum,
+		"uid":         uid,
 	}
 
 	if setting.Service.EnableUserHeatmap {