[FIR] Remove the TODO in FirDelegatedPropertyChecker

This TODO is unclear, and since we don't
really care what should happen to the
unreachable code, it can be ignored.

compiler/fir/checkers/src/org/jetbrains/kotlin/fir/analysis/checkers/declaration/FirTopLevelPropertiesChecker.kt

@@ -150,7 +150,7 @@ internal fun checkPropertyInitializer(
             ) {
                 if (property.receiverParameter != null && !property.hasAnyAccessorImplementation) {
                     reporter.reportOn(propertySource, FirErrors.EXTENSION_PROPERTY_MUST_HAVE_ACCESSORS_OR_BE_ABSTRACT, context)
-                } else if (reachable) { // TODO: can be suppressed not to report diagnostics about no body
+                } else if (reachable) {
                     reportMustBeInitialized(property, isDefinitelyAssignedInConstructor, containingClass, propertySource, reporter, context)
                 }
             }