IR text tests: Unmute tests that have main function

Don't use `main` function in these tests, because `main` function
has specific mangling rules in JVM. Use other function name.

^KT-57755

compiler/testData/ir/irText/firProblems/kt55458.kt.txt

@@ -1,4 +1,4 @@
-fun main() {
+fun runMe() {
   // COMPOSITE {
   val tmp_0: Pair<Int, Int> = 1.to<Int, Int>(that = 2)
   val a: Int = tmp_0.component1()