test: remove wrong dpr impl

Author: James Zetlen

src/lib/mappers/resize.spec.ts

@@ -78,10 +78,7 @@ const valid: Array<[
 ];
 
 type BadCase = [string, boolean];
-const invalid: BadCase[] = [
-  ['width=asgakshd', true],
-  ['width=15&height=aosiygdkj', false]
-];
+const invalid: BadCase[] = [['width=asgakshd', true]];
 const unsupported: BadCase[] = [
   ['width=0.5', true],
   ['height=50', true],

src/lib/mappers/resize.ts

@@ -56,8 +56,7 @@ const resize: Mapper = (sharp, params) => {
     params.warn('invalid', 'width', 'resize with non-numeric width param');
     return false;
   }
-  if (nums[1] && isNaN(height)) {
-    params.warn('invalid', 'height', 'resize with non-numeric height param');
+  if (isNaN(height)) {
     height = undefined;
   }
   debug('width %s, height %s, dpr %s', width, height, dpr);