Scripting: Made TextFile.commit and BinaryFile.commit close as well

Usually commit() would also close the device, except when save writing
of files is disabled. Make sure the device is always closed.

docs/reference/scripting.rst

@@ -1542,9 +1542,9 @@ TextFile.writeLine(text : string) : void
     Writes a string to the file and appends a newline character.
 
 TextFile.commit() : void
-    Commits all written text to disk. Should be called when writing to files in
-    WriteOnly mode. Failing to call this function will result in cancelling the
-    operation, unless safe writing to files is disabled.
+    Commits all written text to disk and closes the file. Should be called when
+    writing to files in WriteOnly mode. Failing to call this function will
+    result in cancelling the operation, unless safe writing to files is disabled.
 
 TextFile.close() : void
     Closes the file. It is recommended to always call this function as soon as
@@ -1598,9 +1598,10 @@ BinaryFile.write(data : ArrayBuffer) : void
     Writes *data* into the file at the current position.
 
 BinaryFile.commit() : void
-    Commits all written data to disk. Should be called when writing to files in
-    WriteOnly mode. Failing to call this function will result in cancelling the
-    operation, unless safe writing to files is disabled.
+    Commits all written data to disk and closes the file. Should be called when
+    writing to files in WriteOnly mode. Failing to call this function will
+    result in cancelling the operation, unless safe writing to files is
+    disabled.
 
 BinaryFile.close() : void
     Closes the file. It is recommended to always call this function as soon as

src/tiled/scriptfile.cpp

@@ -178,6 +178,8 @@ void ScriptBinaryFile::commit()
                                                                          "Could not write to '%1': %2").arg(m_file->fileName(),
                                                                                                             m_file->errorString()));
     }
+
+    close();
 }
 
 void ScriptBinaryFile::close()
@@ -317,6 +319,8 @@ void ScriptTextFile::commit()
                                                                          "Could not write to '%1': %2").arg(m_file->fileName(),
                                                                                                             m_file->errorString()));
     }
+
+    close();
 }
 
 void ScriptTextFile::close()