[iOS] Bump default version to 12 to match engine.

Author: bruvzg

tools/ios.py

@@ -21,7 +21,7 @@ def has_ios_osxcross():
 
 def options(opts):
  opts.Add(BoolVariable("ios_simulator", "Target iOS Simulator", False))
- opts.Add("ios_min_version", "Target minimum iphoneos/iphonesimulator version", "10.0")
+ opts.Add("ios_min_version", "Target minimum iphoneos/iphonesimulator version", "12.0")
  opts.Add(
  "IOS_TOOLCHAIN_PATH",
  "Path to iOS toolchain",