Don't test line numbers on *Package classes

Package classes in line number tests only contain "1" as the first line number
of a single function, so there's no point in testing it. The test was failing
due to the latest changes in the order of generation of classfiles (first $src,
then facade)

compiler/testData/lineNumber/custom/compileTimeConstant.kt

@@ -3,4 +3,4 @@ fun foo() {
             42
 }
 
-// 1 3
+// 3

compiler/testData/lineNumber/custom/ifThen.kt

@@ -8,4 +8,4 @@ fun foo() {
     }
 }
 
-// 1 2 3 6 7 6
+// 2 3 6 7 6

compiler/testData/lineNumber/custom/ifThenElse.kt

@@ -12,4 +12,4 @@ fun foo() {
     }
 }
 
-// 1 2 3 5 8 9 11 8
+// 2 3 5 8 9 11 8

compiler/testData/lineNumber/custom/tryCatchExpression.kt

@@ -12,4 +12,4 @@ fun foo() {
     }
 }
 
-// 1 2 3 5 8 9 11 8
+// 2 3 5 8 9 11 8

compiler/testData/lineNumber/custom/tryCatchFinally.kt

@@ -16,4 +16,4 @@ fun foo() {
     }
 }
 
-// 1 2 3 7 5 7 10 11 15 13 15 10
+// 2 3 7 5 7 10 11 15 13 15 10

compiler/testData/lineNumber/custom/tryFinally.kt

@@ -12,4 +12,4 @@ fun foo() {
     }
 }
 
-// 1 2 3 5 8 9 11 8
+// 2 3 5 8 9 11 8

compiler/testData/lineNumber/custom/when.kt

@@ -12,4 +12,4 @@ fun foo(x: Int) {
     }
 }
 
-// 1 3 4 5 9 10 11 8
+// 3 4 5 9 10 11 8

compiler/testData/lineNumber/custom/whenSubject.kt

@@ -12,4 +12,4 @@ fun foo(x: Int) {
     }
 }
 
-// 1 2 3 4 5 8 9 10 11 8
+// 2 3 4 5 8 9 10 11 8