fix(capacitor-ios): rename podspec to match npm package name

Capacitor CLI derives the pod name from the npm package name:
capacitor-plugin-cdv-purchase → CapacitorPluginCdvPurchase.
The podspec was named CapacitorPluginPurchase, causing "No podspec
found" during pod install.

Author: j3k0

capacitor/CapacitorPluginPurchase.podspec …citor/CapacitorPluginCdvPurchase.podspeccapacitor/CapacitorPluginPurchase.podspec renamed to capacitor/CapacitorPluginCdvPurchase.podspec capacitor/CapacitorPluginPurchase.podspec renamed to capacitor/CapacitorPluginCdvPurchase.podspec

@@ -3,7 +3,7 @@ require 'json'
 package = JSON.parse(File.read(File.join(__dir__, 'package.json')))
 
 Pod::Spec.new do |s|
-  s.name         = 'CapacitorPluginPurchase'
+  s.name         = 'CapacitorPluginCdvPurchase'
   s.version      = package['version']
   s.summary      = package['description']
   s.license      = package['license']

capacitor/ios/CapacitorPluginPurchase.podspec

@@ -3,7 +3,7 @@ require 'json'
 package = JSON.parse(File.read(File.join(__dir__, '..', 'package.json')))
 
 Pod::Spec.new do |s|
-  s.name         = 'CapacitorPluginPurchase'
+  s.name         = 'CapacitorPluginCdvPurchase'
   s.version      = package['version']
   s.summary      = package['description']
   s.license      = package['license']