Refactoring rotten green test on Context

[jordanmontt]

The test ContextTest>>#testHasNonLocalReturn is a rotten green test because:

ContextTest>>#testHasNonLocalReturn
1.	"the method has a non-local return, in some block inside"
2.	self assert: thisContext method hasNonLocalReturn.
3.	"but the context that executes not (as it is later another block context"
4.	self deny: thisContext hasNonLocalReturn.
5.	"this block context has no non-local return"
6.	[ self deny: thisContext hasNonLocalReturn] value.
7.	"but this"
8.	[ self assert: thisContext hasNonLocalReturn. ^self] value.
9.	"again, this is about the context locally, nested blocks to not count"
10.	[ self deny: thisContext hasNonLocalReturn. [^self]] value.
11.	[ self deny: thisContext hasNonLocalReturn. [self assert: thisContext hasNonLocalReturn. ^self]] value

1. in the line 8 there is return so none of the following assertions are done.
2. In the line 11 the second inner block has an assertion that is never execution

In this PR I propose to refactor this test to move the line 8 to the end. The assertion is needed. The return is in the last line so it's not a problem. Remove the second inner block of line 11 as it has exactly the same assertion as the one in line 8.