Update search engine defaults for DE / AU / NZ / IE

[bsclifton]

Description

Update search engine defaults for Germany (DE), Australia (AU), New Zealand (NZ), and IE (Ireland)

Test plan

See https://github.com/brave/internal/issues/789

[stephendonner]

Verified PASSED on Windows 10 using nightly; notes over in brave/brave-core#9397 (comment)

[GeetaSarvadnya]

Verification passed on

Brave | 1.27.107 Chromium: 92.0.4515.107 (Official Build) (64-bit)
-- | --
Revision | 87a818b10553a07434ea9e2b6dccf3cbe7895134-refs/branch-heads/4515@{#1634}
OS | Windows 10 OS Version 2004 (Build 19041.1110)

• Verification notes are linked in https://github.com/brave/internal/issues/789#issuecomment-884992237

---

Verified using

Brave | 1.27.107 Chromium: 92.0.4515.107 (Official Build) (x86_64)
-- | --
Revision | 87a818b10553a07434ea9e2b6dccf3cbe7895134-refs/branch-heads/4515@{#1634}
OS | macOS Version 10.15.7 (Build 19H1217)

Verification notes can be found under https://github.com/brave/internal/issues/789#issuecomment-884975060

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Verification PASSED on Samsung S10+ running Android 11 using the following build:

Brave 1.27.107 Chromium: 92.0.4515.107

• verification notes can be found under https://github.com/brave/internal/issues/789#issuecomment-885422039

---

Verification PASSED on Samsung Galaxy Tab A running Android 10 using the following build:

Brave 1.27.107 Chromium: 92.0.4515.107

• verification notes can be found under https://github.com/brave/internal/issues/789#issuecomment-885422039

---

Verification passed on

Brave	1.27.108 Chromium: 92.0.4515.107 (Official Build) (64-bit)
Revision	87a818b10553a07434ea9e2b6dccf3cbe7895134-refs/branch-heads/4515@{#1634}
OS	Ubuntu 18.04 LTS

Verification done in https://github.com/brave/internal/issues/789#issuecomment-885721851