macos: swiftlint 'unused_optional_binding' rule

macos/.swiftlint.yml

@@ -22,7 +22,6 @@ disabled_rules:
   - no_fallthrough_only
   - switch_case_alignment
   - unused_enumerated
-  - unused_optional_binding
   - vertical_parameter_alignment
 
 identifier_name:

macos/Sources/Helpers/AppInfo.swift

@@ -2,9 +2,5 @@ import Foundation
 
 /// True if we appear to be running in Xcode.
 func isRunningInXcode() -> Bool {
-    if let _ = ProcessInfo.processInfo.environment["__XCODE_BUILT_PRODUCTS_DIR_PATHS"] {
-        return true
-    }
-
-    return false
+    ProcessInfo.processInfo.environment["__XCODE_BUILT_PRODUCTS_DIR_PATHS"] != nil
 }