Silence new stylelint complaint (#3197)

Cf. https://github.com/FreshRSS/FreshRSS/pull/3196#issuecomment-699928812

```
p/themes/Ansum/_layout.scss
 42:4  ✖  Unexpected empty line before rule   rule-empty-line-before
p/themes/Mapco/_layout.scss
 42:4  ✖  Unexpected empty line before rule   rule-empty-line-before
```

p/themes/Ansum/_layout.scss

@@ -38,7 +38,6 @@
 		&.search {
 			// text-align: center;
 			// width: 50%;
-
 			input {
 				width: 230px;
 				color: $sid-font-color;

p/themes/Mapco/_layout.scss

@@ -38,7 +38,6 @@
 		&.search {
 			// text-align: center;
 			// width: 50%;
-
 			input {
 				width: 230px;
 				color: $sid-font-color;