fix: 修复 SFTP 格式化进度可能报错的问题

src/test/kotlin/app/termora/StringFormatTest.kt

@@ -0,0 +1,14 @@
+package app.termora
+
+import org.junit.jupiter.api.assertDoesNotThrow
+import java.util.*
+import kotlin.test.Test
+import kotlin.test.assertFailsWith
+
+class StringFormatTest {
+    @Test
+    fun test() {
+        assertFailsWith(IllegalFormatConversionException::class) { String.format("%.0f%%", 99) }
+        assertDoesNotThrow { String.format("%.0f%%", 99.0) }
+    }
+}