Rename test cases so they are consistent with the rest

Author: Kanchalai Tanglertsampan

tests/cases/compiler/sourceMapValidationDestructuringVariableStatementObjectBindingPattern1.ts

@@ -0,0 +1,3 @@
+// @sourcemap: true
+
+var {x} = { x: 20 };

tests/cases/compiler/sourceMapValidationDestructuringVariableStatementObjectBindingPattern2.ts

@@ -0,0 +1,4 @@
+// @sourcemap: true
+
+var {x} = { x: 20 };
+var { a, b } = { a: 30, b: 40 };