Remove version conditional for find_template_paths

Now that we only support Ruby 2.2+ we don't need this conditional
anymore

Author: rafaelfranca

actionview/lib/action_view/template/resolver.rb

@@ -196,24 +196,12 @@ def query(path, details, formats)
       }
     end
 
-    if RUBY_VERSION >= '2.2.0'
-      def find_template_paths(query)
-        Dir[query].reject { |filename|
-          File.directory?(filename) ||
-            # deals with case-insensitive file systems.
-            !File.fnmatch(query, filename, File::FNM_EXTGLOB)
-        }
-      end
-    else
-      def find_template_paths(query)
-        # deals with case-insensitive file systems.
-        sanitizer = Hash.new { |h,dir| h[dir] = Dir["#{dir}/*"] }
-
-        Dir[query].reject { |filename|
-          File.directory?(filename) ||
-            !sanitizer[File.dirname(filename)].include?(filename)
-        }
-      end
+    def find_template_paths(query)
+      Dir[query].reject { |filename|
+        File.directory?(filename) ||
+          # deals with case-insensitive file systems.
+          !File.fnmatch(query, filename, File::FNM_EXTGLOB)
+      }
     end
 
     # Helper for building query glob string based on resolver's pattern.