Changes

Update/fix matrix images for M_OLine (#3398)

* refs #2053: Update/fix matrix images for M_OLine

Regenerate images using http://latex2png.com at 120dpi

```tex
L = 10^{-7}\cdot
\begin{pmatrix}
5.98 & 4.44 & 4.39 & 3.99 \\
4.44 & 5.81 & 4.09 & 4.23 \\
4.39 & 4.09 & 5.96 & 4.71 \\
3.99 & 4.23 & 4.71 & 6.06
\end{pmatrix}

C = 10^{-12}\cdot
\begin{pmatrix}
23.8 & 101 & 85.6 & 5.09 \\
101 & 27.1 & 20.9 & 71.6 \\
85.6 & 20.9 & 18.3 & 123 \\
5.09 & 71.6 & 123 & 20.7
\end{pmatrix}

G = 10^{-6}\cdot
\begin{pmatrix}
8.05 & 34.2 & 29.1 & 1.76 \\
34.2 & 9.16 & 7.12 & 24.3 \\
29.1 & 7.12 & 5.93 & 41.9 \\
1.76 & 24.3 & 41.9 & 6.64
\end{pmatrix}
```