Change file's package to match directory: add space after package keyword if needed

#KT-39604 Fixed

idea/testData/multiFileLocalInspections/reconcilePackageWithDirectory/changeToNonDefaultPackageFromRootWithPackageKeyword/after/com/example/test.kt

@@ -0,0 +1,3 @@
+package com.example
+
+class Foo

idea/testData/multiFileLocalInspections/reconcilePackageWithDirectory/changeToNonDefaultPackageFromRootWithPackageKeyword/before/com/example/test.kt

@@ -0,0 +1,3 @@
+<caret>package
+
+class Foo

idea/testData/multiFileLocalInspections/reconcilePackageWithDirectory/changeToNonDefaultPackageFromRootWithPackageKeyword/changeToNonDefaultPackageFromRootWithPackageKeyword.test

@@ -0,0 +1,5 @@
+{
+  "mainFile": "com/example/test.kt",
+  "inspectionClass": "org.jetbrains.kotlin.idea.refactoring.move.changePackage.PackageDirectoryMismatchInspection",
+  "fix": "Change file's package to 'com.example'"
+}