Issue #326: Fix statically called non-static method.

[t4k]

Addresses #326.

Review Procedure

Enable PHP error reporting for E_DEPRECATED and load any CORAL page besides the root index and there will be Deprecated messages. Apply this fix and Deprecated messages for this issue are no longer there.

[remocrevo]

@t4k Watch out for whitespacing (tabs vs. spaces) as seen here:
https://patch-diff.githubusercontent.com/raw/coral-erm/coral/pull/327.diff

[t4k]

My interpretation of the discussion at the end of #55 was that we would begin to use the new coding guidelines on all new patches, regardless of the state of the old code, and not update old code just for formatting issues, unless a separate formatting issue is being addressed.

[remocrevo]

I understand the need to not mix coding style changes into an unrelated patch. But in regards to whitespace, as in this case, we are actively changing a single line's indentation style in the middle of a function, which reduces the readability of the code. I don't recall from the discussion, does the new .editorconfig solve this issue?

[t4k]

The new .editorconfig does solve the issue locally. It sets tab width to 2, which makes all the indents visually consistent. I’m not sure if we can set GitHub to respect those settings online though.

[veggiematts]

Out of the space-tabs issue, the fix is ok. I would merge this.

[veggiematts]

Moreover, the API is broken without this patch when error_reporting = E_ALL
This is a serious bug, I'm merging this.