Issue #5: Remove wrong placements on input answer

Signed-off-by: Matheus Horstmann <mch15@inf.ufpr.br>

workspace/fixture/input_answer.csv

 id;id_form_answer;id_input;value;placement
 1; 1; 6;Answer to Question 1 Form 3; 0
-2; 1; 7;Answer to Question 2 Form 3; 1
-3; 2; 4;Answer to Question 2 Form 2; 1
+2; 1; 7;Answer to Question 2 Form 3; 0
+3; 2; 4;Answer to Question 2 Form 2; 0
 4; 2; 5;Answer to Question 1 Form 2; 0
 5; 3; 1;Answer to Question 1 Form 1; 0
-6; 3; 2;Answer to Question 2 Form 1; 1
-7; 3; 3;Answer to Question 3 Form 1; 2
-8; 4; 4;Answer to Question 2 Form 2; 1
+6; 3; 2;Answer to Question 2 Form 1; 0
+7; 3; 3;Answer to Question 3 Form 1; 0
+8; 4; 4;Answer to Question 2 Form 2; 0
 9; 4; 5;Answer to Question 1 Form 2; 0
 10; 5; 6;Answer to Question 1 Form 3; 0
-11; 5; 7;Answer to Question 2 Form 3; 1
+11; 5; 7;Answer to Question 2 Form 3; 0
 12; 6; 1;Answer to Question 1 Form 1; 0
-13; 6; 2;Answer to Question 2 Form 1; 1
-14; 6; 3;Answer to Question 3 Form 1; 2
+13; 6; 2;Answer to Question 2 Form 1; 0
+14; 6; 3;Answer to Question 3 Form 1; 0