feat(mobile/navigation) updated screens that have footer

* feat(mobile/navigation) updated screens that have footer

* feat(chat/native) reverted style change

* feat(chat/native) reverted changes and added input vertical padding

* feat(base/modal) replaced headerHeight with top safe area inset

* feat(carmode/native) removed unused import and fixed linter

* feat(chat/polls/native) reverted style changes

* feat(base/modal) added isModalPresentation default prop

* feat(base/modal) made isModalPresentation optional

* feat(base/modal) headerHeight based on top notch devices

* feat(polls) updated styles

* feat(base/modal) updated comment

react/features/polls/components/native/styles.js

@@ -154,12 +154,12 @@ export const chatStyles = createStyleSheet({
     },
 
     pollCreateButtonsContainer: {
-        paddingVertical: BaseTheme.spacing[2]
+        paddingVertical: '8%'
     },
 
     pollCreateButton: {
         flex: 1,
-        marginHorizontal: 8
+        marginHorizontal: BaseTheme.spacing[2]
     },
 
     pollSendLabel: {
@@ -200,7 +200,8 @@ export const chatStyles = createStyleSheet({
 
     createPollButton: {
         padding: 8,
-        margin: BaseTheme.spacing[2]
+        marginHorizontal: BaseTheme.spacing[2],
+        marginVertical: BaseTheme.spacing[4]
     },
 
     PollPane: {