Diagnostics: Change order of cards to match mocks

Screenshots:
- Diagnostics App (before) http://shortn/_yLwB4ZAKfO
- Diagnostics App (after) http://shortn/_u5OBuBN0Bm

Bug: 1125150
Test: browser_tests --gtest_filter=DiagnosticsApp*
Change-Id: I688332b4ee48867be5b20e9ee0834914f0f6e0f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440927Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Michael Checo <michaelcheco@google.com>
Cr-Commit-Position: refs/heads/master@{#812673}

chromeos/components/diagnostics_ui/resources/diagnostics_app.html

@@ -37,9 +37,9 @@
     <overview-card id="overviewCard"></overview-card>
   </div>
   <div class="diagonstics-cards-container">
-    <memory-card id="memoryCard"></memory-card>
-    <cpu-card id="cpuCard"></cpu-card>
     <battery-status-card id="batteryStatusCard"></battery-status-card>
+    <cpu-card id="cpuCard"></cpu-card>
+    <memory-card id="memoryCard"></memory-card>
   </div>
   <div class="session-log-container">
     <!-- TODO(michaelcheco): Localize string -->