trivial - update Counter.sol based on forge fmt

Author: keone

src/Counter.sol

@@ -11,4 +11,4 @@ contract Counter {
     function increment() public {
         number++;
     }
-}
+}

test/Counter.t.sol

@@ -16,7 +16,7 @@ contract CounterTest is Test {
         counter.increment();
         assertEq(counter.number(), 1);
     }
-    
+
     function testFuzz_SetNumber(uint256 x) public {
         counter.setNumber(x);
         assertEq(counter.number(), x);