Bug 1957152 - Update form_factor to formFactor in RS attributes. r=android-reviewers,gmalekpour

This fixes broken firefox suggest. See [[ https://mozilla.slack.com/archives/C05C9RET70F/p1743191471955339  | this thread ]] for context

Differential Revision: https://phabricator.services.mozilla.com/D243570

Author: issammani

mobile/android/android-components/components/support/remotesettings/src/main/java/mozilla/components/support/remotesettings/RemoteSettingsService.kt

@@ -56,7 +56,7 @@ private fun generateAppContext(context: Context, channel: String, isLargeScreenS
         osVersion = Build.VERSION.RELEASE,
         androidSdkVersion = Build.VERSION.SDK_INT.toString(),
         customTargetingAttributes = JSONObject().apply {
-            put("form_factor", formFactor)
+            put("formFactor", formFactor)
             put("country", locale.country)
         },
         appBuild = null,