Remove unintended side effects from `updatePageData` during `loadFile` initialization.

[Henry8192]

Bug

loadFile uses updatePageData for setting default values during file loading state. However, updatePageData has a few side effects like setting logEventNum and update uiState to ready, which is not expected for this use case.

yscope-log-viewer version

a97a8ed

Environment

N/A

Reproduction steps

• Try printing uiState inside setUiState, notice that uiState changes from UNOPENED to READY to FILE_LOADING to READY;
• logEventNum is set to 0 when file is loading.

[Henry8192]

Fixed by #351.