Use raise_error { instead of raise_error do in specs

* Both work with the latest MSpec, but `raise_error {` is far more common, so make it consistent.

Author: eregon

spec/ruby/language/ensure_spec.rb

@@ -74,9 +74,9 @@
       ensure
         raise "from ensure"
       end
-    }.should raise_error(RuntimeError, "from ensure") do |e|
+    }.should raise_error(RuntimeError, "from ensure") { |e|
       e.cause.message.should == "from block"
-    end
+    }
   end
 end
 

spec/ruby/language/rescue_spec.rb

@@ -428,9 +428,9 @@ def rescuer.===(exception)
         raise "from block"
       rescue (raise "from rescue expression")
       end
-    }.should raise_error(RuntimeError, "from rescue expression") do |e|
+    }.should raise_error(RuntimeError, "from rescue expression") { |e|
       e.cause.message.should == "from block"
-    end
+    }
   end
 
   it "should splat the handling Error classes" do