internal/rule: simplify switch true {...} to switch {...}

Signed-off-by: Iskander Sharipov <[email protected]>

Author: quasilyte

internal/rule/squashjoins.go

@@ -1185,7 +1185,7 @@ func removeRedundantCompoundFilters(
 // isRedundantFilter tells whether the given filter is redundant for joining
 // t1 with t2. t1 MUST be higher in the table hierarchy than t2.
 func isRedundantFilter(f sql.Expression, t1, t2 string) bool {
-	switch true {
+	switch {
 	case t1 == gitbase.RepositoriesTableName && t2 == gitbase.RemotesTableName:
 		return isEq(
 			isCol(gitbase.RepositoriesTableName, "repository_id"),