Fix typo in feTurbulence-negative-basefreq.html

This test had a minor typo which was discovered when upstreaming the
CSS version of the test in
https://chromium-review.googlesource.com/c/chromium/src/+/2134034.

Change-Id: I3f8e0218b2c78dc82bdbe3693ffb51111edefc6e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135545
Commit-Queue: Philip Rogers <pdr@chromium.org>
Commit-Queue: Fredrik Söderquist <fs@opera.com>
Auto-Submit: Philip Rogers <pdr@chromium.org>
Reviewed-by: Fredrik Söderquist <fs@opera.com>
Cr-Commit-Position: refs/heads/master@{#756277}

third_party/blink/web_tests/svg/filters/feTurbulence-negative-basefreq.html

@@ -15,13 +15,13 @@
 
     <!-- type=turbulence -->
     <filter id="tb1" x="0" y="0" width="1" height="1">
-        <feTurbulence type="fractalNoise" baseFrequency="-1 1"/>
+        <feTurbulence type="turbulence" baseFrequency="-1 1"/>
         <feColorMatrix values="1 0 0 0 0, 0 1 0 0 0.5, 0 0 1 0 0, 0 0 0 1 1"/>
     </filter>
     <rect width="100" height="100" filter="url(#tb1)" x="200"/>
 
     <filter id="tb2" x="0" y="0" width="1" height="1">
-        <feTurbulence type="fractalNoise" baseFrequency="1 -1"/>
+        <feTurbulence type="turbulence" baseFrequency="1 -1"/>
         <feColorMatrix values="1 0 0 0 0, 0 1 0 0 0.5, 0 0 1 0 0, 0 0 0 1 1"/>
     </filter>
     <rect width="100" height="100" filter="url(#tb2)" x="300"/>