Show a blue lock for unencrypted rooms and hide the grey shield for encrypted rooms (#30440)

* Show a blue lock instead of a grey shield for unencrypted rooms

* Update screenshots and snapshot

* Update snapshots and fix e2e test that used to expect the grey shield

* lint and add tests for shield

* Update more screen shots

* finish unit test for left icon

* Remove unneeded check

* Don't bother adding stray props to E2EIcon for data-testid

* Upate snapshots

test/unit-tests/components/views/dialogs/__snapshots__/UntrustedDeviceDialog-test.tsx.snap

@@ -22,6 +22,7 @@ exports[`<UntrustedDeviceDialog /> should display the dialog for the device of a
       >
         <div
           class="mx_E2EIcon mx_E2EIcon_warning"
+          data-testid="e2e-icon"
           style="width: 24px; height: 24px;"
         >
           <div
@@ -100,6 +101,7 @@ exports[`<UntrustedDeviceDialog /> should display the dialog for the device of t
       >
         <div
           class="mx_E2EIcon mx_E2EIcon_warning"
+          data-testid="e2e-icon"
           style="width: 24px; height: 24px;"
         >
           <div