Fix test cases

tests/tests/compiler/array/array_access.leo

@@ -5,6 +5,6 @@ expectation: Pass
 
 program test.aleo {
     transition foo(a: [bool; 8]) -> bool {
-        return a[0];
+        return a[0u32];
     }
 }

tests/tests/compiler/array/array_in_composite_data_types.leo

@@ -14,6 +14,6 @@ program test.aleo {
     }
 
     transition foo(a: [[bool; 8]; 8]) -> bool {
-        return a[0][0];
+        return a[0u32][0u32];
     }
 }

tests/tests/compiler/array/array_of_records.leo

@@ -10,6 +10,6 @@ program test.aleo {
     }
 
     transition foo(a: [bar; 8]) -> u8 {
-        return a[0].data;
+        return a[0u32].data;
     }
 }

tests/tests/compiler/array/array_of_structs.leo

@@ -9,6 +9,6 @@ program test.aleo {
     }
 
     transition foo(a: [bar; 8]) -> u8 {
-        return a[0].data;
+        return a[0u8].data;
     }
 }