fix(no-unused-css): blank lines being left after fixing (#701)

Author: rafaelss95

src/noUnusedCssRule.ts

@@ -169,7 +169,7 @@ class UnusedCssVisitor extends BasicCssAstVisitor {
         } = ast;
         // length + 1 because we want to drop the '}'
         const length = endOffset - startOffset + 1;
-        this.addFailureAt(startOffset, length, 'Unused styles', this.createReplacement(startOffset, length, ''));
+        this.addFailureAt(startOffset, length, 'Unused styles', Lint.Replacement.deleteText(startOffset - 1, length + 1));
       }
     } catch (e) {
       logger.error(e);

test/noUnusedCssRule.spec.ts

@@ -868,8 +868,8 @@ describe('no-unused-css', () => {
       )!;
       const replacement = failures[0].getFix() as Replacement;
       expect(replacement.text).to.eq('');
-      expect(replacement.start).to.eq(199);
-      expect(replacement.end).to.eq(246);
+      expect(replacement.start).to.eq(14);
+      expect(replacement.end).to.eq(62);
     });
 
     it('should work with SASS', () => {
@@ -919,8 +919,8 @@ describe('no-unused-css', () => {
       Config.transformStyle = (code: string) => ({ code, map: null });
       const replacement = failures[0].getFix() as Replacement;
       expect(replacement.text).to.eq('');
-      expect(replacement.start).to.eq(168);
-      expect(replacement.end).to.eq(271); // should be 276
+      expect(replacement.start).to.eq(-1);
+      expect(replacement.end).to.eq(29);
     });
   });