Fix generation of PRIMARY KEY constraint on int column

moor/lib/src/runtime/structure/columns.dart

@@ -206,7 +206,7 @@ class GeneratedIntColumn extends GeneratedColumn<int, IntType>
     if (hasAutoIncrement) {
       into.write(' PRIMARY KEY AUTOINCREMENT');
     } else if (declaredAsPrimaryKey) {
-      into.write('PRIMARY KEY');
+      into.write(' PRIMARY KEY');
     }
   }
 

moor/test/columns/int_column_test.dart

@@ -0,0 +1,38 @@
+import 'package:moor/src/runtime/components/component.dart';
+import 'package:test_api/test_api.dart';
+import 'package:moor/moor.dart';
+
+import '../data/tables/todos.dart';
+
+void main() {
+  test('int column writes AUTOINCREMENT constraint', () {
+    final column = GeneratedIntColumn(
+      'foo',
+      'tbl',
+      false,
+      declaredAsPrimaryKey: true,
+      hasAutoIncrement: true,
+    );
+
+    final context = GenerationContext.fromDb(TodoDb(null));
+    column.writeColumnDefinition(context);
+
+    expect(
+        context.sql, equals('foo INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT'));
+  });
+
+  test('int column writes PRIMARY KEY constraint', () {
+    final column = GeneratedIntColumn(
+      'foo',
+      'tbl',
+      false,
+      declaredAsPrimaryKey: true,
+      hasAutoIncrement: false,
+    );
+
+    final context = GenerationContext.fromDb(TodoDb(null));
+    column.writeColumnDefinition(context);
+
+    expect(context.sql, equals('foo INTEGER NOT NULL PRIMARY KEY'));
+  });
+}