Add missing imports in tests

Author: Smit-create

integration_tests/loop_04.py

@@ -1,6 +1,8 @@
 from ltypes import i32
+
 j: i32
 i: i32
+
 for i in range(5):
     j = i
-    print("j: ", j)
+    print("j: ", j)

integration_tests/loop_05.py

@@ -1,5 +1,7 @@
+from ltypes import i32
+
 def f():
-    j :i32 = 0
+    j: i32 = 0
     while True:
         j = j + 1
         print(j)
@@ -8,4 +10,4 @@ def f():
     print("out of outer loop")
     assert j == 5
 
-f()
+f()