refactor: migrate away from deprecated onBackPressed()

Author: naveensingh

app/src/main/kotlin/org/fossify/phone/activities/CallActivity.kt

@@ -108,18 +108,21 @@ class CallActivity : SimpleActivity() {
         }
     }
 
-    override fun onBackPressed() {
+    override fun onBackPressedCompat(): Boolean {
         if (binding.dialpadWrapper.isVisible()) {
             hideDialpad()
-            return
-        } else {
-            super.onBackPressed()
+            return true
         }
 
         val callState = CallManager.getState()
         if (callState == Call.STATE_CONNECTING || callState == Call.STATE_DIALING) {
             toast(R.string.call_is_being_connected)
+            // Allow user to go back but show toast - they can return to call via notification
+            return false
         }
+
+        // Allow minimizing active call - user can return via notification
+        return false
     }
 
     private fun initButtons() = binding.apply {

app/src/main/kotlin/org/fossify/phone/activities/MainActivity.kt

@@ -174,11 +174,12 @@ class MainActivity : SimpleActivity() {
         refreshItems()
     }
 
-    override fun onBackPressed() {
-        if (binding.mainMenu.isSearchOpen) {
+    override fun onBackPressedCompat(): Boolean {
+        return if (binding.mainMenu.isSearchOpen) {
             binding.mainMenu.closeSearch()
+            true
         } else {
-            super.onBackPressed()
+            false
         }
     }