[tests] Fix failing test because of incoherent assertion

Signed-off-by: Emmanuel Bigeon <emmanuel@bigeon.fr>

gclc-swt/src/test/java/net/bigeon/gclc/swt/PromptReadingRunnableTest.java

@@ -96,7 +96,7 @@ public class PromptReadingRunnableTest {
 
         runnable.run();
         logger.setLevel(back);
-        Mockito.verify(reader, Mockito.times(3)).readLine();
+        Mockito.verify(reader, Mockito.times(1)).readLine();
     }
 
 }