[051-movie-explorer] update from src_sqlite to tbl

[jhk0530]

Hello team, In movie explorer's code

shiny-examples/051-movie-explorer/server.R

Lines 8 to 11 in 8d55896

	# Set up handles to database tables on app start
	db <- src_sqlite("movies.db")
	omdb <- tbl(db, "omdb")
	tomatoes <- tbl(db, "tomatoes")

The src_sqlite() function was deprecated in {dplyr} 1.0.0, (latest version is 1.1.4)
and it guides to use tbl() function instead as warning message below.

Warning: `src_sqlite()` was deprecated in dplyr 1.0.0.
ℹ Please use `tbl()` directly with a database connection
Call `lifecycle::last_lifecycle_warnings()` to see where this warning was generated.

So how about using DBI::dbConnect and RQLite::SQLite() that suggested in src_sqlite() document?

Example docs

con <- DBI::dbConnect(RSQLite::SQLite(), ":memory:")
copy_to(con, mtcars)

Final result

# Set up handles to database tables on app start
con <- DBI::dbConnect(RSQLite::SQLite(), "movies.db")
omdb <- dplyr::tbl(con, "omdb")
tomatoes <- dplyr::tbl(con, "tomatoes")

Thanks.