Preprocess people_page for os_settings rollup

These files have <if> statements which were included
in os_settings_rollup.js because the preprocess="true"
argument was omitted.

Bug: 1045266
Change-Id: Ic458b7847262989f2ec8f681d8ac4110ef99259a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2372587
Commit-Queue: Claude van der Merwe <cvandermerwe@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801106}

chrome/browser/resources/settings/chromeos/os_settings_resources_v3.grdp

@@ -152,11 +152,13 @@
   <include name="IDR_OS_SETTINGS_PEOPLE_PAGE_SYNC_BROWSER_PROXY_M_JS"
            file="${root_gen_dir}/chrome/browser/resources/settings/people_page/sync_browser_proxy.m.js"
            use_base_dir="false"
+           preprocess="true"
            compress="false"
            type="BINDATA" />
   <include name="IDR_OS_SETTINGS_PEOPLE_PAGE_SYNC_ACCOUNT_CONTROL_M_JS"
            file="${root_gen_dir}/chrome/browser/resources/settings/people_page/sync_account_control.m.js"
            use_base_dir="false"
+           preprocess="true"
            compress="false"
            type="BINDATA" />
   <include name="IDR_OS_SETTINGS_PEOPLE_PAGE_SYNC_ENCRYPTION_OPTIONS_M_JS"
@@ -172,11 +174,13 @@
   <include name="IDR_OS_SETTINGS_PEOPLE_PAGE_SYNC_CONTROLS_M_JS"
            file="${root_gen_dir}/chrome/browser/resources/settings/people_page/sync_controls.m.js"
            use_base_dir="false"
+           preprocess="true"
            compress="false"
            type="BINDATA" />
   <include name="IDR_OS_SETTINGS_PEOPLE_PAGE_SYNC_PAGE_M_JS"
            file="${root_gen_dir}/chrome/browser/resources/settings/people_page/sync_page.m.js"
            use_base_dir="false"
+           preprocess="true"
            compress="false"
            type="BINDATA" />
   <include name="IDR_OS_SETTINGS_SETTINGS_PRIVACY_PAGE_M_JS"