fix(ios): removed default value (#46020)

Summary:
Removed UIReturnKeyDefault as it caused bug when there wasn't any type.

## Changelog:

[IOS] [REMOVED]: UIReturnKeyDefault

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[ANDROID|GENERAL|IOS|INTERNAL] [BREAKING|ADDED|CHANGED|DEPRECATED|REMOVED|FIXED|SECURITY] - Message

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Pull Request resolved: #46020

Reviewed By: christophpurrer

Differential Revision: D61277058

Pulled By: cipolleschi

fbshipit-source-id: 18349c49b05d492a2c2ed5713af3ceb6d3728e70

packages/react-native/Libraries/Text/TextInput/RCTBaseTextInputView.mm

@@ -654,8 +654,6 @@ - (void)setCustomInputAccessoryViewWithNativeID:(NSString *)nativeID
 - (NSString *)returnKeyTypeToString:(UIReturnKeyType)returnKeyType
 {
  switch (returnKeyType) {
- case UIReturnKeyDefault:
- return @"Default";
  case UIReturnKeyGo:
  return @"Go";
  case UIReturnKeyNext:
@@ -683,7 +681,6 @@ - (void)initializeReturnKeyType
 {
  returnKeyTypesSet = [NSSet setWithObjects:@(UIReturnKeyDone),
  @(UIReturnKeyGo),
- @(UIReturnKeyDefault),
  @(UIReturnKeyNext),
  @(UIReturnKeySearch),
  @(UIReturnKeySend),

packages/react-native/React/Fabric/Mounting/ComponentViews/TextInput/RCTTextInputComponentView.mm

@@ -503,8 +503,6 @@ - (void)setTextAndSelection:(NSInteger)eventCount
 - (NSString *)returnKeyTypeToString:(UIReturnKeyType)returnKeyType
 {
  switch (returnKeyType) {
- case UIReturnKeyDefault:
- return @"Default";
  case UIReturnKeyGo:
  return @"Go";
  case UIReturnKeyNext:
@@ -532,7 +530,6 @@ - (void)initializeReturnKeyType
 {
  returnKeyTypesSet = [NSSet setWithObjects:@(UIReturnKeyDone),
  @(UIReturnKeyGo),
- @(UIReturnKeyDefault),
  @(UIReturnKeyNext),
  @(UIReturnKeySearch),
  @(UIReturnKeySend),