[infra] ToTiOS to run as ios-sim

MB config was migrated incorrectly for ToTiOS. Should've been
ios-simulator for ToTiOS, but was set with iOS device.

Change-Id: I24925356843aeccc55d36e7c2a9c52d8e48fd09d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2125473Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754573}

tools/mb/mb_config.pyl

@@ -1230,7 +1230,7 @@
 
     'android_release_trybot_fastbuild': [
       'android', 'release_trybot', 'strip_debug_info', 'android_fastbuild',
-      'android_no_proguard', 
+      'android_no_proguard',
     ],
 
     'android_release_trybot_fastbuild_webview_google': [
@@ -1831,7 +1831,7 @@
     'ios_error': [ 'error'],
 
     'ios_clang_tot': [
-      'clang_tot', 'ios_device', 'ios_disable_code_signing', 'release', 'static',
+      'clang_tot', 'ios_simulator', 'ios_disable_code_signing', 'release', 'static',
     ],
 
     'ios_clang_device_tot': [